color.gle
Color subroutines
sub color_range_horizontal zmin zmax zstep palette$ width height format$ pixels
draws a horizontal color range
sub color_range_vertical zmin zmax zstep palette$ width height format$ pixels
draws a vertical color range
sub palette_blue_white_red z
sub palette_blue_purple_red z
sub set_palette_shade_gray_fade fade
sub set_palette_shade_gray_color red green blue