This command allows you to choose contour line colors
different from the default colors.

Widget:
- From the "Custom Lines" menu select the "Color" submenu. Then
select one of: "Both", "Pos", "Neg" or "Default". If you did not
select Default you continue on and select a color (see Custom Lines).
Command:
Arguments :
- color: at least one line color, and possibly two, may be
entered. The first color specifies the color used for contour lines
whose value > 0, and the second specifies the color used for
contour lines whose value < 0. If only one color is specified,
that color is used for all contour lines. valid choices for color
are :
- RED
- BLUE
- GREEN
- VIOLET
- BROWN
- BLACK
- WHITE
- DEFAULT
Examples :
- LINECOLOR = GREEN,YELLOW
produces a plot where the contour lines <= 0 are green and the
contour lines > 0 are yellow.
- LINECOLOR = DEFAULT
contour lines are drawn in their default colors; contour lines
<= 0 are blue, and contour lines > 0 are red.
Notes :
- This option remains in effect until changed.
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