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(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.