0 Black      0.   0.   0.
 1 Gray1      0.08 0.08 0.08
 2 Gray2      0.17 0.17 0.17
 3 Gray3      0.25 0.25 0.25
 4 Gray4      0.33 0.33 0.33
 5 Gray5      0.42 0.42 0.42
 6 Gray6      0.50 0.50 0.50
 7 Gray7      0.58 0.58 0.58
 8 Gray8      0.67 0.67 0.67
 9 Gray9      0.75 0.75 0.75
10 Gray10     0.83 0.83 0.83
11 Gray11     0.92 0.92 0.92
12 White      1.00 1.00 1.00
13 Red        0.7  0.   0.
14 Green      0.   0.7  0.
15 Blue       0.   0.   0.7