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MARKER variablename | ( x y z h) |

       (SYMBOL name | number <scale>)

 If a variable name or a  coordinate point (x,y,z,h) is given, draw  the
 current marker symbol at the indicated position, using either  absolute
 or relative coordinates, according to the optional second keyword.   If
 the second keyword is omitted, ABSOLUTE is assumed.

 If the SYMBOL keyword is given, it must be followed by a marker  symbol
 name or number which is to be used for marking the points in subsequent
 MARKER and POLYMARKER commands.  Marker numbers  in the range 1 ..   20
 select predefined markers, and other  values are taken modulo 20.   For
 convenience, the symbol names Asterisk, Bell, Circle, Club,  Crosshair,
 Dagger, Diamond, Dot, Double-Dagger, Five-Point-Star, Heart, Paragraph,
 Plus, Shamrock, Six-Point-Star,  Spade, Square, Swiss-Cross,  Triangle,
 and X  may  be used.   The  marker name  or  number may  be  optionally
 followed by a marker  size scale factor, the  default value being  1.0.
 Thus, "MARKER SYMBOL Heart 0.5" would select a half-size heart  marker.