TEK_COLOR procedure loads a 32-color
colortable similar to the default Tektronix 4115 colortable. This colortable is useful because of its distinct colors.
By default, this palette consists of 32 colors. The first 9 colors are: Index 0=black, 1=white, 2=red, 3=green, 4=blue, 5=cyan, 6=magenta, 8=orange.
[, Start_Index, Colors]
An optional starting index for the palette. The default is 0. If this argument is included, the colors are loaded into the current colortable starting at the specified index.
The number of colors to load. The default is 32, which is also the maximum.