Here is an example of the steps needed to get a median dark and flat, 
generate a set of slope images from raw images, and combine dithers into a 
mosaic:

1) Form median dark

IDL> median_of_all_reads_xrg, DetStr='H2RG-32-147', ElecStr='ASIC', Date='07Dec14', thisfilter='Blank', objectname='Dark', objecttext='', nreads=30, /override, /useref

2)

3)

4) Slopefit batch

IDL> slopefit_xrg, detstr='H2RG-32-147', elecstr='ASIC', objectname='SAO116737', /useref, /darksub, date='07Dec14', nreads=30, thisfilter='I' 

5) Form List of dithers for each filter

IDL> form_dither_list_xrg, 'H2RG-32-147', 'ASIC', '07Dec14', 30, 'SAO116737', 'I', 'SAO116737_I_Slopes.lst', objecttext='_Dither', RawOutName='SAO116737_I_RawFiles.lst'

6) Combine The dithers

IDL> combine_dithers_xrg,'/nfs/slac/g/ki/ki03/lances/H2RG-32-147/ASIC/Reduced/07Dec14/SAO116737/','SAO116737_I_Slopes.lst', /tvflag