CONVERT

        [GREG2\]CONVERT A0 D0 [Angle] [/TYPE Ptype]  [/UNIT  Unit]  [/SYSTEM
    System] [/VAR Varx Vary]

    This command assumes that the X,Y buffers (or the 1-D variables Varx and
    Vary  if  option  /VAR is used) contain data in the specified projection
    (or in absolute spherical coordinates if Ptype is  NONE)  in  the  given
    angular  unit  (Degree  Minute  Seconds  or  the default Radian), in the
    specified System (GALACTIC or EQUATORIAL, default  current  system)  and
    converts  them  to  the  current  system,  as defined by SET SYSTEM, and
    projection, as defined by command PROJECTION.  Note that  the  projected
    coordinates  are  always  natural units (i.e.  the equivalent of Radians
    after projection).  There is no provision for "hidden" parts  which  are
    treated exactly as visible ones.

      A0 D0 are Hours and Degrees if the input system is EQUATORIAL, Degrees
    otherwise.

    CAUTION: when using variables, the Varx and Vary arrays MUST BE  REAL*8,
    and WRITEABLE (see HELP DEFINE).