SLICE

        [DISPLAY\]SLICE VarName Start1 Start2 End1 End2 UNIT

      Cut  a slice through the 3-D image variable VarName with the specified end
    points. UNIT is a keyword indicating in which units the  end  ponts  coordi-
    nates  are  specified.  It can be PIXELS, DEGREE, MINUTE, SECOND, RADIAN, of
    ABSOLUTE.  For ABSOLUTE, Start1 and End1 are assumed  to  be  in  hours  and
    Start2 End2 in degrees, with sexagesimal notation allowed.

        [DISPLAY\]SLICE VarName StartX StartY Unit ANGLE AngleValue

      This  alternate syntax allows to specify a starting point and an orientar-
    ion of the slice. The coordinates StartX StartY  are  in  the  angular  unit
    specified  by  Unit  (which  can  be ABSOLUTE) AngleValue is in Degree.  The
    Slice length will be automatically computed to  intersect  the  whole  cube.
    This syntax can be more convenient to compare parallel slices, or slices in-
    tersecting at a common point that can be specified by StartX StartY.

        [DISPLAY\]SLICE

      This simple syntax will call the cursor IF and ONLY IF the current display
    is that of a single plane (a pure 2-D array or one plane of  3-D array). The
    start and end point can then be defined interactively.

    In  all  case, the result is available in the SLICED image variable, and can
    be displayed by SHOW SLICED.