infile, s, a, "", , ,	">Input science data file template name"
outfile, s, a, "", , ,	">Output time file template name"
earth_ephem, s, a, "stsdas$data/scidata/de200", , ,">table name of earth's state vectors"
obs_ephem, s, a, "", , ,	">table name of observer's state vectors"
mu_ra, r, a, 0., , ,	">RA proper motion at J2000 (seconds of TIME/year)"
mu_dec, r, a, 0., , ,	">Dec proper motion at J2000 (ARC seconds/year)"
distance, r, a, 0., , ,	">distance of the target" 
dist_unit, s, a, "arcsec", "arcsec|pc|ly|au|km", ,	">unit of distance"

mode, s, h, "al"