flatfield

Photometric data taken with the arrays should always be divided by the flatfield so that sky removal can be performed at a later stage. Of course, for two and three bolometer chopping the flatfield command must be used (see § ). The current flatfield file is called photflat1.dat and should ideally reside in the data reduction directory unless it is used as default by flatfield. Note that photflat1.dat does not yet contain values for the outer ring of SW bolometers. The change_flat command can be used to switch between flatfield files. Note that it is necessary to do this before applying the flatfield.