Usage: issaffld [-v] Long  Lat  Coord  [Equinox [Band [HCON]]]
   or: issaffld -c[v|b] RA(degrees)  Dec(degrees) [Band [HCON]]

   -v turns off verbose output (default is on) and
      returns only the filename for the best plate
   -b turns off verbose output and returns the filename for
      the best plate, followed by the reject flag and the north flag
   -c bypasses the use of the coordinate calculator
      so that RA and DEC inputs are interpreted as decimal
      degrees in B1950 coordinates.

      Inputs Long, Lat and Coord specify the Longitude,
      Latitude, and Coordinate System (first 2 characters,
      upper or lower case) of the desired position.
      Coordinate Systems are:

           Equatorial     (eq)
           Ecliptic       (ec)
           Galactic       (ga)
           Supergalactic  (su)

      If the Coordinate System is Equatorial the fourth
      argument, if present, is expected to be the equinox.
      Band (optional) is the IRAS band number (1,2,3,4).
      HCON (optional) is the IRAS HCON (0 for coadd,1,2,3).
      Sexagesimal notation maybe used (without the -c option).

      Coordinates may be specified:
         nnHnnMnn.nS    nnDnnMnn.nS
         nnH nnM nn.nS  nnD nnM nn.nS
         nn:nn:nn.n
         nnnnn.nS        (for decimal arc seconds)
         nnnnn.nnn       (for decimal degrees)

    EXAMPLES:
         issaffld 7 45 eq
         issaffld 00h30m01.8s 45d10m12.0s Equ
         issaffld 00h27m19.7s 44d53m37.8s Equ 2000
         issaffld 00d28m00.0s 63d59m28.0s Ecliptic
         issaffld 00d28m00.0s 63d59m28.0s ec 4 3
         issaffld 128d45m40.5s -37d22m28.1s ga 3

 Output
 Column:       Description:

 Reject?       -Contains 'R' if the field was rejected in processing
 Best          -Field with largest target to edge distance has '>'
 Field Number  -ISSA Field number (1<=Fn<=430)
 Nearest Edge  -Distance to edge from target position (arc minutes)
 Field Center  -Decimal RA/Dec (B1950) at the center of field
 ISSA Disk#    -CDROM numbers on which this field is located
                Disks 0 and 1 contain only coadded images
                  (Reject plates are in separate subdirectory
                   on disks 0 and 1.
                Disks 2-9  contain coadded and HCON images
                Disks 7-9  contain rejected coadd and HCON images
 File          -If a particular IRAS Band or HCON was specified
                   this field will be present giving the image
                   file name:
                     iFFFbBhH.fit (FFF-field#, B-Band, H-HCON )

   Authors: Rick Ebert, J. White & Xiuqin Wu
            Infrared Processing and Analysis Center
            (c) 1991,1993 California Institute of Technology
   Revision Number: 3.0 (May 5, 1993)
   CDROM Manifest: ISSA 1993 Release
