Dealing with lines in the other sideband

 Quite often it happens that one feels quite clever in having set up a special frontend and DAS configuration in order to observe two or more lines in both sidebands simultaneously. That is the easy part; dealing with the data reduction, especially making a map of the line(s) in the other sideband requires a knowledge of the information in Section . As an example of the application of this, the following map-making file is offered as an example of how to make a map of CS 7-6 in the lower sideband, having observed CO 3-2 in the upper sideband. Various lines have been commented out, but can be brought into service as required:

! map-adding procedure
! CS 7-6 
! 
declare scan i4
declare first i4
declare last i4
ask 'scan?' scan ?
ask 'first subscan?' first ?
ask 'last subscan?' last ?
do n first last
s-l-r-f 0 0 0 0
r-g-d \scan\n\
das-merge\#\n\
change-sideband
s-l-r-f 342.8833
set-int n
! decent baselines:
r-l-b\-55 -35\30 70\
! poor baselines
!f-p-b\-80 -40\-26 0\^Z\3\;sub
drop 100 1000
! n
a-t-m
enddo