to get:      use:
   -------      ---
   WHITE     	243
   BLACK     	244
   RED       	245
   GREEN     	246
   BLUE      	247
   LTBLUE    	248
   MAGENTA   	249
   YELLOW    	250
   ORANGE    	251
   PURPLE    	252
   DARKGREEN 	253
   GRAY      	254
		

for a 10-element rainbow without yellow, e.g., use

  Color Indices for Lines: [1,25,49,73,97,121,188,207,225,243]
  IDL Color Table for Indices: -1