input, s, a, "", , , "list of table names"
earth_ephem, s, a, "stsdas$data/fits/de200.fits", , ,"table name of earth's state vectors"
obs_ephem, s, a, "", , , "table name of observer's state vectors"
distance, r, a, 0., , , "distance of the target" 
dist_unit, s, a, "arcsec", "arcsec|pc|ly|au|km", , "unit of distance"
in_col, s, h, "TIME", , , "time column name"
verbose, b, h, yes, , , "print timing and other info?"
Version, s, h, "2Mar2001", , , "date of installation"
mode, s, h, "al"