Now that you've obtained your measurement set (MS), you will probably want to look at it carefully to see what it contains. This CASA Guide will describe a set of CASA tasks designed to help you evaluate and understand the data in an MS.
Following the example in Loading Data, we will be using the MS TVER0002.sb2568947.eb2579996.55518.22356400463.ms in this Guide. Please see Loading Data for instructions on acquiring this dataset, or use your own MS for practice.
Checking the online flags
It's useful to start by checking which data have already been deleted (flagged) by the "online" flags (including time periods when the antennas were pointing off-source, or there were focus or subreflector errors), as well as data that were flagged because they were shadowed or zero-valued.