gray        0.00000,1.0,0.0 0.00000,0.0,0.0
grey        0.00000,1.0,0.0 0.00000,0.0,0.0
red         0.00000,0.9,0.1 0.00000,0.1,0.9
green       0.33333,0.9,0.1 0.33333,0.1,0.9
blue        0.66667,0.9,0.1 0.66667,0.1,0.9
seaweed     0.78,1.0,0.1    0.4,0.1,0.9
redgreen    0.00000,0.2,0.9 0.33333,0.2,0.9 symmetric
redblue     0.00000,0.2,0.9 0.66667,0.2,0.9 symmetric