GSC

        GSC [RAmin RAmax DECmin  DECmax]  [/MAGNITUDE  Mlim]  [/EPOCH  date]
    [/OUTPUT File Ident] [/MERGE]

    Search and plots all stars in the Guide Star Catalog with magnitude less
    than  Mlim  (brighter  than Mlim) in the (RA,DEC) box specified by RAmin
    RAmax DECmin DECmax (if present, and in the current Greg box  otherwise,
    provided that the coordinate system is equatorial). Please note that the
    very brightest stars (V<6) have only been added at version 1.1 and  will
    be  missing  if  you  are  using  GSC  version  1.0. Most of them can be
    obtained by using the ASTROM command.  The current marker type  is  used
    and  the  size  depends  on  the  current  marker  size  and on the star
    magnitude.

    No proper motion is applied as this  information  is  not  available  in
    versions  1.x  of  the  GSC  catalog. The /EPOCH option is therefore not
    used.

    If option /EQUINOX is present, the stars are precessed to the equinox it
    specifies.  They  are  otherwise precessed to the equinox of the map, as
    defined in variable G_EPOCH.

    If option /OUTPUT is present, star positions and magnitudes  with  their
    error  estimates,  are  written in the specified file (which defaults to
    user  terminal),  together  with  some  ancillary  Guide  Star   Catalog
    information (original plate, multiplicity flag,...). The presence of the
    second argument, Ident, will generate an identification number for  each
    star  in  the output file, and plot this number near the star's position
    on the graphic display. Useful for identification purposes. The list  of
    information stored in the file is located under subtopic Format

    If  option  /MERGE  is  present,  multiple  detections  of  objects   on
    overlapping  plates are merged (by simple averaging). Individual entries
    are otherwise plotted and listed.

    NOTES:
      - Palomar/SRC Survey Schmidt Plates (POSS#I) are squares of size 35.56
        cm (14 inches) with a scale of 67.14 Arcsec. per mm.
      - ESO Survey Plates are squares of size 30 cm with  a  scale  of  67.6
        Arcsec. per mm.
    If you want to make overlays, do not forget the /EXACT option in command
    HARDCOPY/PLOT ...