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| == Help on imcontsub task: ==
| | {{imcontsub}} |
| <pre>
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| Subtracts specified continuum channels from a spectral line data set
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| For a spectral line image, the regions to determine the continuum
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| regions are first defined. A graphical interface 'regions' is
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| the most versatile method of selecting the line-free regions. For
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| a multi-spw image, the chanellization must be the same for all.
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| The continuum channels are specified and two output images are made: a
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| continuum image and a continuum-subtracted spectral line image.
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| The continuum subtraction can be applied to either the whole image
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| (default) or a selected regions. Regions are specified via
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| the box,chans, and stokes parameters or with a region file
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| given by the region parameter.
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| Keyword arguments:
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| imagename -- Input spectral line image
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| Default: none; Example: imagename='ngc5921_task.im'
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| linefile -- Name of output line image
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| Default: none; Example: outline='ngc5921_line.im'
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| contfile -- Name of output continuum image
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| Default: none; Example: contfile='ngc5921_cont.im'
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| fitorder -- Polynomial order for the continuum estimation.
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| Default: 0; Example fitorder=2
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| region -- ImageRegion file to define continuum
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| Default: ''; none
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| Example: region='myimage.im.rgn'
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| region='region1'
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| Use the viewer on the image cube to define the continuum,
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| regions. More general than box/chans. Still experimental
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| to retrieve the list of names.
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| box -- A box region on the directional plane
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| ONLY pixel values acceptable at this time.
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| Default: none (whole 2-D plane); Example: box='10,10,50,50'
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| chans -- channel numbers go select for the continuum,
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| ONLY channel numbers accepted at this time.
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| Default: none (all);
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| Example: chans='3~6;>40'
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| stokes -- Stokes parameters to image, may or may not be separated
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| by commas but best if you use commas.
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| Default: none (all); Example: stokes='IQUV';
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| Options: 'I','Q','U','V','RR','RL','LR','LL','XX','YX','XY','YY', ...
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| </pre>
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