M100 Band3 ACA 4.2.2
From CASA Guides
- This guide requires CASA 4.1.0 and assumes that you have downloaded M100_Band3_7m_CalibratedData.tgz from M100Band3#Obtaining_the_Data
- Details of the ALMA observations are provided at M100Band3
- This portion of the guide covers calibration of the raw visibility data. To skip to the imaging portion of the guide, see: M100Band3 Imaging 4.1.
Overview
This part of the M100 Band 3 7m CASA guide will step you through the calibration of the visibility data. We will begin by flagging (marking as bad) data known to be useless before any inspection, for example data where one telescope blocks the line of sight of another. Then we will apply telescope-generated calibration tables to partially correct for atmospheric effects. After inspecting the data, we will flag some additional data that exhibit pathologies. Then we will use observations of the calibrators Titan and 3c279 to derive the phase and amplitude response of individual antennas as a function of time and frequency ("phase", "amplitude", and "bandpass" calibrations). We will apply these to the data and then extract the calibrated source data into a file appropriate for imaging.
The general procedure in this guide follows the other ALMA CASA guides: NGC3256Band3 and TWHydraBand7.
Unpack the Data
Once you have downloaded the M100_Band3_7m_CalibratedData.tgz, unpack the file in a terminal outside CASA using
tar -xvzf M100_Band3_7m_CalibratedData.tgz
then change directory to the new directory
cd M100_Band3_7m_CalibratedData
You may wish to type
ls
to look at the files present. You should see a set of files with extension ".ms". These are CASA measurement set (MS) files. The data have already been converted to MS format from the native ALMA format using the CASA task importasdm. In addition to the data, we provide you with calibration tables containing system temperature (Tsys), water vapor radiometer (WVR), and antenna position information. For Early Science, these tables will either be pre-applied or supplied with the data.
This guide requires Python module analysisUtils. If you have not already installed analysisUtils please follow the link to do so.
To begin, start CASA by typing
casapy
Be sure that you are using the version indicated at the top of this page.
Confirm your version of CASA
This guide has been written for CASA release 4.1.0. Please confirm your version before proceeding.
# In CASA
version = casadef.casa_version
print "You are using " + version
if (version < '4.1.0'):
print "YOUR VERSION OF CASA IS TOO OLD FOR THIS GUIDE."
print "PLEASE UPDATE IT BEFORE PROCEEDING."
else:
print "Your version of CASA is appropriate for this guide."
Install Analysis Utilities
Analysis Utilities (or analysisUtils for short) is a small set of Python scripts that provide a number of analysis and plotting utilities for ALMA data reduction. This guide uses a few of these utilities. They are very easy to install (just download and untar). See
http://casaguides.nrao.edu/index.php?title=Analysis_Utilities
for a full description and download instructions. Analysis Utilities are updated frequently so if its been a while since you installed it, its probably worth doing it again. If you are at an ALMA site or ARC, the analysis utilities are probably already installed and up to date.
Initial Inspection
First we will take stock of what we have. If you have not already done so, begin by reviewing the description of the observations here: M100Band3. The 6 data sets each target mosaic, as follows:
- uid___A002_X5e971a_X124.ms
- uid___A002_X5e971a_X2e7.ms
- uid___A002_X5e9ff1_X3f3.ms
- uid___A002_X5e9ff1_X5b3.ms
- uid___A002_X60b415_X44.ms
- uid___A002_X62f759_X4eb.ms
The first step is to get basic information about the data: targets observed, time range, spectral setup, and so on. We do this using the task listobs, which will output a detailed summary of each dataset. Enter the following commands into CASA:
# In CASA
# Define a python list holding the names of all of our data sets
basename=['uid___A002_X5e971a_X124','uid___A002_X5e971a_X2e7','uid___A002_X5e9ff1_X3f3','uid___A002_X5e9ff1_X5b3', 'uid___A002_X60b415_X44','uid___A002_X62f759_X4eb']
# Initialize user-input string. (for Python testing)
dummy_string = ''
# Loop over each element in the list and create summary file using listobs
for asdm in basename_all:
os.system('rm '+asdm+'.listobs.txt')
listobs(vis=asdm+'.ms', listfile=asdm+'.listobs.txt', verbose=True)
Note that after cutting and pasting a 'for' loop like this you often have to press return twice to execute. You may also want to take care to paste a line at a time if you are having trouble copy and pasting. Even better, you can use "cpaste" to paste blocks of code. To do so type "cpaste" at the CASA prompt, paste your commands, and then type "--" and hit return on the final (otherwise empty) line. This should look something like this:
CASA <8>: cpaste Pasting code; enter '--' alone on the line to stop. :basename=['uid___A002_X5e971a_X124','uid___A002_X5e971a_X2e7','uid___A002_X5e9ff1_X3f3','uid___A002_X5e9ff1_X5b3', 'uid___A002_X60b415_X44','uid___A002_X62f759_X4eb'] : :for asdm in basename_all: : print asdm :-- uid___A002_X5e971a_X124 uid___A002_X5e971a_X2e7 uid___A002_X5e9ff1_X3f3 uid___A002_X5e9ff1_X5b3 uid___A002_X60b415_X44 uid___A002_X62f759_X4eb CASA <9>:
cpaste should be much more robust than copying-and-pasting directly into the shell but if you have trouble, just carefully paste one line at a time directly into CASA and hit return until the desired command executes.
These commands define a python list called "basename_all", which contains the name of all 6 MS files. The "for" loop executes for each element in basename_all, calling listobs and directing the output to a file called, e.g., "uid___A002_X5e971a_X124.listobs.txt" for the first measurement set. You can browse through the listobs output as you would normally look at a text file (use emacs, vi, or another editor). You can also send the output to the terminal from inside of CASA. To do so type:
# In CASA
os.system('cat uid___A002_X60b415_X44.listobs.txt')
or
# In CASA
os.system('more uid___A002_X60b415_X44.listobs.txt')
CASA knows a few basic shell commands like 'cat', 'ls', and 'rm' but for more complex commands you will need to run them inside 'os.system("command")'. For more information see http://casa.nrao.edu/ .
Here is an example of the (abridged) output from listobs for the first dataset in the list, uid___A002_X60b415_X44.ms, which targets the Northern Mosaic. You would see this if you had specified verbose to be False in the listobs call:
================================================================================
MeasurementSet Name: /lustre/naasc/almauser/M100Band3/uid___A002_X60b415_X44.ms MS Version 2
================================================================================
Observer: cvlahakis Project: uid://A002/X5d9e5c/X3e5
Observation: ALMA
Data records: 867780 Total integration time = 5258.45 seconds
Observed from 14-Apr-2013/03:34:07.7 to 14-Apr-2013/05:01:46.1 (UTC)
ObservationID = 0 ArrayID = 0
Date Timerange (UTC) Scan FldId FieldName nRows nUnflRows SpwIds Average Interval(s) ScanIntent
14-Apr-2013/03:34:07.2 - 03:36:10.2 1 0 J1229+0203 43200 43200.00 [0, 1, 2, 3, 4, 5, 6, 7] [1.01, 1.01, 1.01, 1.01, 1.01, 1.01, 1.01, 1.01] CALIBRATE_POINTING#ON_SOURCE
03:37:56.2 - 03:38:56.7 2 0 J1229+0203 45360 45360.00 [8, 9, 10, 11, 12, 13, 14, 15] [0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48] CALIBRATE_SIDEBAND_RATIO#ON_SOURCE
03:39:47.2 - 03:40:58.4 3 0 J1229+0203 12960 12960.00 [8, 9, 10, 11, 12, 13, 14, 15] [0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48] CALIBRATE_ATMOSPHERE#ON_SOURCE
03:41:43.5 - 03:51:49.2 4 0 J1229+0203 118800 44880.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] CALIBRATE_BANDPASS#ON_SOURCE
03:53:17.4 - 03:54:28.7 5 1 Titan 12960 12960.00 [8, 9, 10, 11, 12, 13, 14, 15] [0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48] CALIBRATE_ATMOSPHERE#ON_SOURCE
03:55:12.1 - 04:00:14.9 6 1 Titan 59400 22440.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] CALIBRATE_AMPLI#ON_SOURCE,CALIBRATE_FLUX#ON_SOURCE
04:01:48.2 - 04:02:59.5 7 2 J1215+1654 12960 12960.00 [8, 9, 10, 11, 12, 13, 14, 15] [0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48] CALIBRATE_ATMOSPHERE#ON_SOURCE
04:03:47.5 - 04:04:48.0 8 2 J1215+1654 11880 4488.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] CALIBRATE_PHASE#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 3 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 4 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 5 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 6 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 7 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 8 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 9 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 10 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 11 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 12 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 13 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 14 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:06:04.5 - 04:12:43.9 9 15 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:12:48.3 - 04:13:18.6 10 16 M100-2 5940 2396.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:13:44.1 - 04:14:44.6 11 2 J1215+1654 11880 4488.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] CALIBRATE_PHASE#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 3 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 4 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 5 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 17 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 18 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 19 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 20 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 21 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 22 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 23 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 24 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 25 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:15:17.3 - 04:21:56.7 12 26 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:22:22.5 - 04:23:23.0 13 2 J1215+1654 11880 4488.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] CALIBRATE_PHASE#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 6 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 7 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 8 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 9 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 10 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 11 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 12 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 13 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 14 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 15 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 17 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 18 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:23:56.3 - 04:30:35.7 14 19 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:31:47.2 - 04:32:58.5 15 2 J1215+1654 12960 12960.00 [8, 9, 10, 11, 12, 13, 14, 15] [0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48] CALIBRATE_ATMOSPHERE#ON_SOURCE
04:33:13.1 - 04:34:13.6 16 2 J1215+1654 11880 4488.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] CALIBRATE_PHASE#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 3 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 4 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 5 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 6 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 7 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 8 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 20 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 21 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 22 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 23 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 24 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 25 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:34:46.9 - 04:41:26.4 17 26 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:42:37.1 - 04:44:40.2 18 2 J1215+1654 43200 43200.00 [0, 1, 2, 3, 4, 5, 6, 7] [1.01, 1.01, 1.01, 1.01, 1.01, 1.01, 1.01, 1.01] CALIBRATE_POINTING#ON_SOURCE
04:45:50.9 - 04:46:51.4 19 2 J1215+1654 11880 4488.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] CALIBRATE_PHASE#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 9 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 10 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 11 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 12 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 13 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 14 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 15 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 17 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 18 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 19 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 20 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 21 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:47:53.3 - 04:54:32.8 20 22 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:55:44.0 - 04:56:55.2 21 2 J1215+1654 12960 12960.00 [8, 9, 10, 11, 12, 13, 14, 15] [0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48, 0.48] CALIBRATE_ATMOSPHERE#ON_SOURCE
04:57:09.6 - 04:58:10.2 22 2 J1215+1654 11880 4488.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] CALIBRATE_PHASE#ON_SOURCE
04:58:43.1 - 05:00:14.8 23 23 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:58:43.1 - 05:00:14.8 23 24 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
04:58:43.1 - 05:00:14.8 23 25 M100 5940 2244.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] OBSERVE_TARGET#ON_SOURCE
05:00:46.1 - 05:01:46.6 24 2 J1215+1654 11880 4488.00 [16, 17, 18, 19, 20, 21, 22, 23] [10.1, 1.01, 10.1, 1.01, 10.1, 1.01, 10.1, 1.01] CALIBRATE_PHASE#ON_SOURCE
(nRows = Total number of rows per scan)
Fields: 27
ID Code Name RA Decl Epoch SrcId nRows nUnflRows
0 none J1229+0203 12:29:06.699720 +02.03.08.59820 J2000 0 220320 146400.00
1 none Titan 14:30:17.288151 -11.57.52.07612 J2000 1 72360 35400.00
2 none J1215+1654 12:15:03.979130 +16.54.37.95700 J2000 2 165240 113496.00
3 none M100 12:22:57.009007 +15.49.13.60358 J2000 3 17820 6732.00
4 none M100 12:22:57.009041 +15.49.58.08112 J2000 3 17820 6732.00
5 none M100 12:22:54.339884 +15.47.22.41016 J2000 3 17820 6732.00
6 none M100 12:22:54.339918 +15.48.06.88770 J2000 3 17820 6732.00
7 none M100 12:22:54.339952 +15.48.51.36524 J2000 3 17820 6732.00
8 none M100 12:22:54.339986 +15.49.35.84278 J2000 3 17820 6732.00
9 none M100 12:22:54.340020 +15.50.20.32032 J2000 3 17820 6732.00
10 none M100 12:22:51.670863 +15.47.44.64936 J2000 3 17820 6732.00
11 none M100 12:22:51.670897 +15.48.29.12690 J2000 3 17820 6732.00
12 none M100 12:22:51.670931 +15.49.13.60444 J2000 3 17820 6732.00
13 none M100 12:22:51.670966 +15.49.58.08198 J2000 3 17820 6732.00
14 none M100 12:22:49.001808 +15.47.22.41102 J2000 3 17820 6732.00
15 none M100 12:22:49.001842 +15.48.06.88856 J2000 3 17820 6732.00
16 none M100-2 12:22:59.677993 +15.48.06.88685 J2000 4 5940 2396.00
17 none M100 12:22:49.001876 +15.48.51.36610 J2000 3 17820 6732.00
18 none M100 12:22:49.001911 +15.49.35.84364 J2000 3 17820 6732.00
19 none M100 12:22:49.001945 +15.50.20.32118 J2000 3 17820 6732.00
20 none M100 12:22:59.677959 +15.47.22.40931 J2000 3 17820 6732.00
21 none M100 12:22:59.677993 +15.48.06.88685 J2000 3 17820 6732.00
22 none M100 12:22:59.678027 +15.48.51.36439 J2000 3 17820 6732.00
23 none M100 12:22:59.678061 +15.49.35.84193 J2000 3 17820 6732.00
24 none M100 12:22:59.678095 +15.50.20.31947 J2000 3 17820 6732.00
25 none M100 12:22:57.008938 +15.47.44.64850 J2000 3 17820 6732.00
26 none M100 12:22:57.008973 +15.48.29.12604 J2000 3 11880 4488.00
Spectral Windows: (24 unique spectral windows and 1 unique polarization setups)
SpwID Name #Chans Frame Ch1(MHz) ChanWid(kHz) TotBW(kHz) BBC Num Corrs
0 ALMA_RB_03#BB_1#SW-01#FULL_RES 124 TOPO 91955.512 -15625.000 1937500.0 1 XX YY
1 ALMA_RB_03#BB_1#SW-01#CH_AVG 1 TOPO 90986.762 1937500.000 1937500.0 1 XX YY
2 ALMA_RB_03#BB_2#SW-01#FULL_RES 124 TOPO 93893.012 -15625.000 1937500.0 2 XX YY
3 ALMA_RB_03#BB_2#SW-01#CH_AVG 1 TOPO 92924.262 1937500.000 1937500.0 2 XX YY
4 ALMA_RB_03#BB_3#SW-01#FULL_RES 124 TOPO 102033.637 15625.000 1937500.0 3 XX YY
5 ALMA_RB_03#BB_3#SW-01#CH_AVG 1 TOPO 102986.762 1937500.000 1937500.0 3 XX YY
6 ALMA_RB_03#BB_4#SW-01#FULL_RES 124 TOPO 104033.637 15625.000 1937500.0 4 XX YY
7 ALMA_RB_03#BB_4#SW-01#CH_AVG 1 TOPO 104986.762 1937500.000 1937500.0 4 XX YY
8 ALMA_RB_03#BB_1#SW-01#FULL_RES 128 TOPO 101942.187 -15625.000 2000000.0 1 XX YY
9 ALMA_RB_03#BB_1#SW-01#CH_AVG 1 TOPO 100926.562 1781250.000 1781250.0 1 XX YY
10 ALMA_RB_03#BB_2#SW-01#FULL_RES 128 TOPO 103757.337 -15625.000 2000000.0 2 XX YY
11 ALMA_RB_03#BB_2#SW-01#CH_AVG 1 TOPO 102741.712 1781250.000 1781250.0 2 XX YY
12 ALMA_RB_03#BB_3#SW-01#FULL_RES 128 TOPO 111814.962 15625.000 2000000.0 3 XX YY
13 ALMA_RB_03#BB_3#SW-01#CH_AVG 1 TOPO 112783.712 1781250.000 1781250.0 3 XX YY
14 ALMA_RB_03#BB_4#SW-01#FULL_RES 128 TOPO 113689.962 15625.000 2000000.0 4 XX YY
15 ALMA_RB_03#BB_4#SW-01#CH_AVG 1 TOPO 114658.712 1781250.000 1781250.0 4 XX YY
16 ALMA_RB_03#BB_1#SW-01#FULL_RES 4080 TOPO 101945.850 -488.281 1992187.5 1 XX YY
17 ALMA_RB_03#BB_1#SW-01#CH_AVG 1 TOPO 100949.756 1992187.500 1992187.5 1 XX YY
18 ALMA_RB_03#BB_2#SW-01#FULL_RES 4080 TOPO 103761.000 -488.281 1992187.5 2 XX YY
19 ALMA_RB_03#BB_2#SW-01#CH_AVG 1 TOPO 102764.906 1992187.500 1992187.5 2 XX YY
20 ALMA_RB_03#BB_3#SW-01#FULL_RES 4080 TOPO 111811.300 488.281 1992187.5 3 XX YY
21 ALMA_RB_03#BB_3#SW-01#CH_AVG 1 TOPO 112806.906 1992187.500 1992187.5 3 XX YY
22 ALMA_RB_03#BB_4#SW-01#FULL_RES 4080 TOPO 113686.300 488.281 1992187.5 4 XX YY
23 ALMA_RB_03#BB_4#SW-01#CH_AVG 1 TOPO 114681.906 1992187.500 1992187.5 4 XX YY
Sources: 80
ID Name SpwId RestFreq(MHz) SysVel(km/s)
0 J1229+0203 0 - -
0 J1229+0203 1 - -
0 J1229+0203 2 - -
0 J1229+0203 3 - -
0 J1229+0203 4 - -
0 J1229+0203 5 - -
0 J1229+0203 6 - -
0 J1229+0203 7 - -
0 J1229+0203 8 - -
0 J1229+0203 9 - -
0 J1229+0203 10 - -
0 J1229+0203 11 - -
0 J1229+0203 12 - -
0 J1229+0203 13 - -
0 J1229+0203 14 - -
0 J1229+0203 15 - -
0 J1229+0203 16 100950 0
0 J1229+0203 17 100950 0
0 J1229+0203 18 102794.1 0
0 J1229+0203 19 102794.1 0
0 J1229+0203 20 112794.1 0
0 J1229+0203 21 112794.1 0
0 J1229+0203 22 114669.1 0
0 J1229+0203 23 114669.1 0
1 Titan 8 - -
1 Titan 9 - -
1 Titan 10 - -
1 Titan 11 - -
1 Titan 12 - -
1 Titan 13 - -
1 Titan 14 - -
1 Titan 15 - -
1 Titan 16 100950 0
1 Titan 17 100950 0
1 Titan 18 102794.1 0
1 Titan 19 102794.1 0
1 Titan 20 112794.1 0
1 Titan 21 112794.1 0
1 Titan 22 114669.1 0
1 Titan 23 114669.1 0
2 J1215+1654 8 - -
2 J1215+1654 9 - -
2 J1215+1654 10 - -
2 J1215+1654 11 - -
2 J1215+1654 12 - -
2 J1215+1654 13 - -
2 J1215+1654 14 - -
2 J1215+1654 15 - -
2 J1215+1654 16 100950 0
2 J1215+1654 17 100950 0
2 J1215+1654 18 102794.1 0
2 J1215+1654 19 102794.1 0
2 J1215+1654 20 112794.1 0
2 J1215+1654 21 112794.1 0
2 J1215+1654 22 114669.1 0
2 J1215+1654 23 114669.1 0
3 M100 16 100950 0
3 M100 17 100950 0
3 M100 18 102794.1 0
3 M100 19 102794.1 0
3 M100 20 112794.1 0
3 M100 21 112794.1 0
3 M100 22 114669.1 0
3 M100 23 114669.1 0
4 M100-2 16 100950 0
4 M100-2 17 100950 0
4 M100-2 18 102794.1 0
4 M100-2 19 102794.1 0
4 M100-2 20 112794.1 0
4 M100-2 21 112794.1 0
4 M100-2 22 114669.1 0
4 M100-2 23 114669.1 0
1 J1215+1654 0 - -
1 J1215+1654 1 - -
1 J1215+1654 2 - -
1 J1215+1654 3 - -
1 J1215+1654 4 - -
1 J1215+1654 5 - -
1 J1215+1654 6 - -
1 J1215+1654 7 - -
Antennas: 9:
ID Name Station Diam. Long. Lat. Offset from array center (m) ITRF Geocentric coordinates (m)
East North Elevation x y z
0 CM01 N602 7.0 m -067.45.17.4 -22.53.22.3 8.8051 -527.8582 22.2020 2225080.355251 -5440132.954544 -2481524.788728
1 CM02 J502 7.0 m -067.45.17.7 -22.53.23.0 2.1080 -549.4457 22.1445 2225070.957996 -5440127.669076 -2481544.654037
2 CM03 J503 7.0 m -067.45.17.4 -22.53.23.2 9.2490 -555.0632 22.1288 2225076.734614 -5440122.930049 -2481549.823089
3 CM04 N605 7.0 m -067.45.17.4 -22.53.23.9 9.6893 -575.8354 22.0848 2225074.068123 -5440115.247556 -2481568.942507
4 CM05 J506 7.0 m -067.45.17.9 -22.53.23.2 -4.9545 -555.3423 22.1246 2225063.546149 -5440128.202838 -2481550.078574
5 CM06 N606 7.0 m -067.45.17.1 -22.53.23.6 19.2003 -566.5681 22.0994 2225084.240675 -5440114.995944 -2481560.410623
6 CM07 N601 7.0 m -067.45.17.0 -22.53.22.5 21.0638 -532.5813 22.1847 2225090.999703 -5440126.598845 -2481529.133183
7 CM09 N603 7.0 m -067.45.17.7 -22.53.22.3 -0.0492 -527.8651 22.1892 2225072.154695 -5440136.293016 -2481524.790109
8 CM12 J504 7.0 m -067.45.17.0 -22.53.23.0 22.2034 -550.2532 22.1445 2225089.438292 -5440119.771079 -2481545.397950
And here is an extract from the full verbose listobs for uid___A002_X1ff7b0_X1c8.ms, which targets the Southern Mosaic (note that we have snipped out the record of individual scans):
================================================================================
MeasurementSet Name: /lustre/naasc/almauser/AntennaeBand7/uid___A002_X1ff7b0_X1c8.ms MS Version 2
================================================================================
Observer: Unknown Project: T.B.D.
Observation: ALMA
Data records: 175615 Total integration time = 4927.1 seconds
Observed from 28-May-2011/02:50:18.2 to 28-May-2011/04:12:25.3 (UTC)
<snip>
Fields: 33
ID Code Name RA Decl Epoch SrcId nVis
0 none 3c279 12:56:11.16657 -05.47.21.5247 J2000 0 12232
1 none Titan 12:42:44.82765 -01.43.41.4224 J2000 1 10615
2 none 3c279 12:56:11.16600 -05.47.21.5250 J2000 2 27764
3 none Antennae 12:01:53.17008 -18.52.37.9200 J2000 3 4829
4 none Antennae 12:01:52.18699 -18.53.30.3952 J2000 3 3883
5 none Antennae 12:01:52.64413 -18.53.26.6494 J2000 3 3883
6 none Antennae 12:01:53.10127 -18.53.22.9035 J2000 3 3872
7 none Antennae 12:01:53.55841 -18.53.19.1577 J2000 3 4818
8 none Antennae 12:01:54.01554 -18.53.15.4119 J2000 3 4829
9 none Antennae 12:01:54.47268 -18.53.11.6661 J2000 3 4829
10 none Antennae 12:01:54.92982 -18.53.07.9203 J2000 3 3872
11 none Antennae 12:01:55.38696 -18.53.04.1744 J2000 3 3883
12 none Antennae 12:01:55.84409 -18.53.00.4286 J2000 3 4840
13 none Antennae 12:01:56.30123 -18.52.56.6828 J2000 3 4818
14 none Antennae 12:01:52.18700 -18.53.22.9033 J2000 3 4829
15 none Antennae 12:01:52.64414 -18.53.19.1575 J2000 3 4818
16 none Antennae 12:01:53.10128 -18.53.15.4116 J2000 3 4818
17 none Antennae 12:01:53.55842 -18.53.11.6658 J2000 3 4840
18 none Antennae 12:01:54.01555 -18.53.07.9200 J2000 3 3872
19 none Antennae 12:01:54.47269 -18.53.04.1742 J2000 3 4829
20 none Antennae 12:01:54.92983 -18.53.00.4284 J2000 3 4829
21 none Antennae 12:01:55.38697 -18.52.56.6825 J2000 3 4829
22 none Antennae 12:01:55.84410 -18.52.52.9367 J2000 3 4829
23 none Antennae 12:01:51.72988 -18.53.19.1572 J2000 3 4818
24 none Antennae 12:01:52.18702 -18.53.15.4114 J2000 3 4829
25 none Antennae 12:01:52.64415 -18.53.11.6656 J2000 3 4829
26 none Antennae 12:01:53.10129 -18.53.07.9197 J2000 3 2266
27 none Antennae 12:01:53.55843 -18.53.04.1739 J2000 3 2266
28 none Antennae 12:01:54.01557 -18.53.00.4281 J2000 3 3212
29 none Antennae 12:01:54.47270 -18.52.56.6823 J2000 3 3234
30 none Antennae 12:01:54.92984 -18.52.52.9365 J2000 3 3212
31 none Antennae 12:01:55.38698 -18.52.49.1906 J2000 3 2266
32 none Antennae 12:01:55.84411 -18.52.45.4448 J2000 3 3223
(nVis = Total number of time/baseline visibilities per field)
Spectral Windows: (9 unique spectral windows and 2 unique polarization setups)
SpwID #Chans Frame Ch1(MHz) ChanWid(kHz) TotBW(kHz) Corrs
0 4 TOPO 184550 1500000 7500000 I
1 3840 TOPO 344845.586 488.28125 1875000 XX YY
2 1 TOPO 343908.086 1875000 1875000 XX YY
3 3840 TOPO 356845.586 488.28125 1875000 XX YY
4 1 TOPO 343908.086 1875000 1875000 XX YY
5 128 TOPO 344900.518 15625 2000000 XX YY
6 1 TOPO 343892.705 1796875 1796875 XX YY
7 128 TOPO 356900.518 15625 2000000 XX YY
8 1 TOPO 343892.705 1796875 1796875 XX YY
Antennas: 11:
ID Name Station Diam. Long. Lat.
0 DV02 A015 12.0 m -067.45.15.3 -22.53.26.0
1 DV04 J505 12.0 m -067.45.18.0 -22.53.22.8
2 DV06 T704 12.0 m -067.45.16.2 -22.53.22.1
3 DV07 A004 12.0 m -067.45.15.9 -22.53.28.0
4 DV08 A072 12.0 m -067.45.12.6 -22.53.24.0
5 DV09 A008 12.0 m -067.45.15.4 -22.53.26.8
6 DV10 A009 12.0 m -067.45.16.1 -22.53.26.1
7 DV11 A016 12.0 m -067.45.16.4 -22.53.25.1
8 PM01 T702 12.0 m -067.45.18.6 -22.53.24.1
9 PM02 A017 12.0 m -067.45.15.9 -22.53.26.8
10 PM03 J504 12.0 m -067.45.17.0 -22.53.23.0
This output shows that three sources were observed in each data set: 3c279, Titan, and the Antennae.
- The Antennae are our science target. Note that the source name changes between the Northern Mosaic, where it is "NGC4038 - Antennae", and the Southern Mosaic, where it is just "Antennae". Also note that the source corresponds to a number of individual fields (see the Field ID column). These are the individual mosaic pointings. There are 23 for the Northern Mosaic and 29 for the Southern Mosaic.
- Titan is observed once and will be used to set the absolute flux scale of the data.
- 3c279 plays two roles: it will serve as our bandpass calibrator, to characterize the frequency response of the antennas, and because it is fairly close on the sky to the Antennae (18.6 degrees away) it will serve as our secondary calibrator (also referred to as the "phase calibrator" or "gain calibrator"), to track changes in the phase and amplitude response of the telescopes over time. Observations of 3c279 are interleaved with observations of the Antennae.
The output also shows that the data contain many spectral windows. Using the labeling scheme in the listobs above these are:
- spw 0 targets ~185 GHz and holds water vapor radiometer data
- spw 1 and spw 3 hold our science data. These are "Frequency Domain Mode" (FDM) data with small (0.49 MHz) channel width and wide (1.875 GHz) total bandwidth. As a result these have a lot of channels (3840). spw 1 holds the lower sideband (LSB) data and includes the CO(3-2) line. We will focus on these data. For the CO(3-2) line the channel width corresponds to 0.426 km/s and the bandwidth of spw 1 to 1634 km/s.
- spw 2 and spw 4 hold frequency-averaged versions of spw 1 and 3 ("Channel 0" for those familiar with AIPS). These are used for some quick automated inspection. We will not use them here but we will carry out an equivalent inspection using spw 1.
- spw 5 and spw 7 hold lower a resolution processing ("Time Domain Mode", TDM) of the data from the same part of the spectrum (baseband) as spws 1 and 3. These data have only 128 channels across 2 GHz bandwidth and so have a much coarser channel spacing than the FDM data. These were used to generate the calibration tables that we include in the tarball but will not otherwise appear in this guide.
The final column of the listobs output in the logger (not shown above) gives the scan intent. Later we will use this information to flag the pointing scans and the hot and ambient load calibration scans.
We'll now have a look at the configuration of the antennas used to take the data using the task plotants (<xr id="Uid_A002_X1ff7b0_Xb.ANT.png"/>).
<figure id="Uid_A002_X1ff7b0_Xb.ANT.png">
</figure>
# In CASA
basename_all=["uid___A002_X1ff7b0_Xb","uid___A002_X207fe4_X3a","uid___A002_X207fe4_X3b9",
"uid___A002_X2181fb_X49","uid___A002_X1ff7b0_X1c8","uid___A002_X207fe4_X1f7",
"uid___A002_X207fe4_X4d7","uid___A002_X215db8_X18","uid___A002_X215db8_X1d5",
"uid___A002_X215db8_X392"]
for asdm in basename_all:
print "Antenna configuration for : "+asdm
plotants(vis=asdm+'.ms', figfile=asdm+'.plotants.png')
clearstat()
dummy_string = raw_input("Hit <Enter> to see the antenna configuration for the next data set.")
This will loop through all 10 data sets, show you the antenna position for each, and save that as a file named, e.g., "uid___A002_X1ff7b0_Xb.plotants.png" for the first data set. The "raw_input" command asks CASA to wait for your input before proceeding. If you would prefer to just browse the .png files after the fact you can remove this. Notice that the antenna setup changes, but only slightly, over the course of the 10 data sets.
