input,s,a,,,,Input VOTable names
base,s,q,,,,Base output file name
extn,s,h,"fits",,,Filename extension
format,s,h,"fits",,,Format to download
acref,s,h,"VOX:Image_AccessReference",,,UCD to identify access reference
col,i,h,INDEF,,,Column number to use for acref
sequential,b,h,yes,,,Use sequential file numbers
nthreads,i,h,4,,,Number of download threads?
list,b,h,yes,,,List instead of download access refs?
mode,s,h,"al"