iraf.net

Hello,I need to combine two multislit images (from GMOS; I've done it slit by slit actually), because I have only one calibration lamp (same observation field; different grating). So what I need is that one of the images "migrates" to the space of the second one (the latter being the one that does have a lamp, which should stay unmoved for this to work). Now I used lscombine to do this and I get a good result from looking to it, but how can I know exactly what was done? Does it keep one unmoved and fit the other one (which one?) or does it "average" them in dispersion space? (They are the same in the y axis.)I haven't found any of this in the help page, I'd really appreciate your help.Thanks for your time.
Cheers!