Parameter spw

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5.2.8 Parameter spw

The spw parameter selects the spectral windows that will be used to form the image, and possibly a subset of channels within these windows.

The spw parameter is a string with an integer, list of integers, or a range, e.g.

  spw = ’1’                #  select spw 1
  spw = ’0,1,2,3’          #  select spw 0,1,2,3
  spw = ’0~3’              #  same thing using ranges

You can select channels in the same string with a : separator, for example

spw = ’1:10~30’ # select channels 10-30 of spw 1
spw = ’0:5~55,3:5;6;7’ # chans 5-55 of spw 0 and 5,6,7 of spw 3

This uses the standard syntax for spw selection is given in § 2.3.3. See that section for more options.

Note that the order in which multiple spws are given is important for mode = ’channel’, as this defines the origin for the channelization of the resulting image.

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