int convex_hull_ncolor = 70;
unsigned char convex_hull[3*70] = {
	0, 0, 0, 
	52, 1, 0, 
	52, 0, 2, 
	1, 27, 0, 
	1, 0, 136, 
	1, 0, 138, 
	106, 0, 0, 
	106, 0, 2, 
	10, 0, 254, 
	1, 54, 0, 
	1, 5, 254, 
	160, 0, 0, 
	63, 0, 254, 
	0, 82, 0, 
	0, 32, 254, 
	213, 1, 0, 
	213, 0, 4, 
	117, 0, 254, 
	1, 109, 0, 
	1, 59, 254, 
	254, 7, 0, 
	254, 0, 36, 
	170, 1, 254, 
	0, 136, 0, 
	0, 87, 254, 
	254, 34, 0, 
	254, 0, 174, 
	224, 0, 254, 
	1, 163, 0, 
	1, 114, 254, 
	254, 62, 0, 
	254, 12, 254, 
	1, 190, 0, 
	1, 141, 254, 
	254, 89, 0, 
	254, 39, 254, 
	0, 218, 0, 
	0, 169, 254, 
	255, 115, 0, 
	255, 66, 254, 
	1, 245, 0, 
	1, 196, 254, 
	254, 143, 1, 
	254, 94, 254, 
	35, 255, 1, 
	0, 255, 91, 
	0, 223, 254, 
	255, 170, 1, 
	255, 121, 254, 
	89, 254, 1, 
	1, 255, 229, 
	1, 250, 254, 
	254, 198, 1, 
	254, 149, 254, 
	142, 255, 1, 
	45, 255, 254, 
	254, 225, 1, 
	254, 175, 254, 
	195, 255, 1, 
	99, 255, 254, 
	255, 252, 1, 
	255, 202, 254, 
	249, 255, 1, 
	152, 255, 252, 
	152, 255, 254, 
	254, 255, 127, 
	254, 255, 128, 
	254, 230, 254, 
	206, 255, 252, 
	206, 254, 254, 
};