1 PLANE_OLD
        PLANE_OLD

    This is a (very) simple task that subtracts a plane from an  image.  The
    plane  is  determined  by  three  non-colinear non-blanked pixels of the
    original map.  The plane image is also computed.  This task is usually a
    first   step  before  more  elaborate  background  algorithms  (such  as
    BACKGROUND or MAKE_BACK) are applied.
2 Z_NAME$
        PLANE:  Z_NAME$

    The name of the input image.
2 Y_NAME$
        PLANE:  Y_NAME$

    The name of the image that will contain the subtracted plane  (which  is
    normally useless).
2 X_NAME$
        PLANE:  X_NAME:

    The name of the output  image  that  will  contain  the  result  of  the
    subtraction.
2 X_PIXEL$
        PLANE:  X_PIXEL$[3]

    The X coordinates (in pixels) of the  the  3  pixels  that  defines  the
    subtracted  plane.   Try  to  choose  three typical pixels that define a
    nearly equilateral triangle.
2 Y_PIXEL$
        PLANE:  Y_PIXEL$[3]

    The Y coordinates (in pixels) of the  the  3  pixels  that  defines  the
    subtracted  plane.   Try  to  choose  three typical pixels that define a
    nearly equilateral triangle.
2 BLANKING$
        PLANE:  BLANKING$[2]

    The blanking value and blanking tolerance for both  the  input  and  the
    output  images.   This  information  is only used if no blanking section
    exists in the header of the input image.  d b in 4 i -4  1  PLANE  i  +4
    PLANE

    This is a (very) simple task that subtracts a plane  from  an   imageThe
    plane  is  determined  by  three  non-colinear non-blanked pixels of the
    original map  The plane image is also computed  This task is  usually  a
    first   step  before  more  elaborate  background  algorithms  (such  as
    BACKGROUND or MAKE__BACK) are appliedi -4  2  Z__NAME$  i  +4  TASK\FILE
    "Input image" Z__NAME$

    The name of the input imagei -4 2  Y__NAME$  i  +4  TASK\FILE  "Residual
    image" Y__NAME$

    The name of the image that will contain the subtracted plane  (which  is
    normally useless)i -4 2 X__NAME$ i +4 TASK\FILE "Output plane" X__NAME$

    The name of the output  image  that  will  contain  the  result  of  the
    subtractioni  -4  2 X__PIXEL$ i +4 TASK\INTEGER "X coordinates of points
    in pixels" X__PIXEL$[3]

    The X coordinates (in pixels) of the  the  3  pixels  that  defines  the
    subtracted   plane   Try  to  choose  three typical pixels that define a
    nearly equilateral  trianglei  -4  2  Y__PIXEL$  i  +4  TASK\INTEGER  "Y
    coordinates of points in pixels" Y__PIXEL$[3]

    The Y coordinates (in pixels) of the  the  3  pixels  that  defines  the
    subtracted   plane   Try  to  choose  three typical pixels that define a
    nearly equilateral trianglei -4 2 BLANKING$  i  +4  TASK\REAL  "Blanking
    value and tolerance" BLANKING$[2]

    The blanking value and blanking tolerance for both  the  input  and  the
    output   images   This  information  is only used if no blanking section
    exists in the header of the input imagei -4 1 END