Parameters

 Keyword  Position  Type       Description
 -------  --------  ----       -----------
  FRAME      1      INTEGER    Coordinate frame
                                1 = RA/DEC
       Default = 1              2 = Ecliptic
                                3 = Galactic
                                4 = axis coordinates
                                5 = pixel coordinates
  RA1        2      CHAR       RA of first point
  DEC1       3      CHAR       DEC     "     "
  RA2        4      CHAR       RA of second point
  DEC2       5      CHAR       DEC     "     "
  ELON1      -      DOUBLE     Ecliptic longitude (dec. deg.)
  ELAT1      -      DOUBLE     Ecliptic latitude    "    "
  ELON2      -      DOUBLE     Ecliptic longitude (dec. deg.)
  ELAT2      -      DOUBLE     Ecliptic latitude    "    "
  L1         -      DOUBLE     Galactic longitude of first point.
  B1         -      DOUBLE     Galactic latitude  "    "     "
  L2         -      DOUBLE     Galactic longitude of second point.
  B2         -      DOUBLE     Galactic latitude  "     "      "
  X1         -      REAL       X-coord of first point.
  Y1         -      REAL       Y-coord "    "     "
  X2         -      REAL       X-coord of second point.
  Y2         -      REAL       Y-coord "     "     "
  XPIX1      -      REAL       X-pixel of first point.
  YPIX1      -      REAL       Y-pixel "    "     "
  XPIX2      -      REAL       X-pixel of second point.
  YPIX2      -      REAL       Y-pixel "     "     "