void contcolor (colors, bord, line_styles) CNTPLT.C Level 1
 
int *colors An array of color values.See color(). The array must be at least as large as the number of contour levels that will be plotted.
int bord = FILL_CONTOURS_NO_BORDERS causes contcolor() to activate filled contours where colors is used to set the panel pattern for each contour level. No border will be drawn around the resulting polygons.
= FILL_CONTOURS_WITH_BORDERS causes contcolor() to activate filled contours where colors is used to set the panel pattern for each contour level. A border will be drawn around the resulting polygons.
= CONTOUR_LINE_ATTRIBUTES uses colors for setting the line colors and line_styles sets the line styles used for each contour.
int *line_styles An array of line style values. The array must be at least as large as the number of contour levels that will be plotted.
 
Use contcolor() to set the attributes (colors and line style) of your contours. It must be called before the call to the contour-plotting routine. Different results will obtain  if one or both of the two arrays are set to NULL: 

If colors == NULL and line_styles != NULL, only the line styles will be affected and the color active when the 
contour routine is called will be used.

If line_styles == NULL only the line colors will change and the line style active when the contour routine is called will be used.

If both are NULL the line style and color that are active when the contour drawing routine is called will be used.

The local array pointers in the contour drawing routines are set to NULL after each set of contours so you will 
need to call contcolor() before each call to a contour drawing routine if you want to use this feature.