About creating spectrum with IMSPEC

[renovatio]

Dear all,

IMSPEC is a very good task to create a spectrum from a data cube. However, I was wondering what about creating an identical spectrum from CARMA data to a single dish beam size. Let me explain with an example. 

I have a CARMA data and would like to create a spectrum to see what the flux looks like with a single dish antenna (lets say single dish beam size is 22"). I can use IMSPEC and define a box which has 22"x22" dimensions and create the spectrum. But this is a box, not a circle, or do not have a Gaussian shape. So, what happens to the pixels outside the box when IMSPEC does its job? Does IMSPEC give zero to those pixels and just sum all the pixels inside the box? If so, it would not be quite correct, since all the pixels (including outside of the box) should be weighted by the Gaussian beam of the single dish I think. Does IMSPEC do such weighting? Since IMSPEC deals with a unit conversion from Jy/beam to Jy, I think it should therefore be doing something related to the beam. But that beam is the synthesized beam of CARMA array, not the beam that I would like to get the flux of. 

Any idea for properly creating spectrum from CARMA data for a given single dish beam size?

Many thanks in advance,

[Peter Teuben]

setting aside the issue that an interferometer may have missing
spacings, what you could do is use
smooth or convol to smooth to the SD beam, and then you can use imspec
on just a single pixel.

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