group_start 0 type 1 density 0.200000 linear 0.00000 150.000 color 1.00000 1.00000 1.60000 1.00000 group_end 0 group_start 1 type 1 density 0.600000 linear -0.600000 -0.01000000 color 1.65000 1.65000 1.70000 1.00000 group_end 1 group_start 2 type 0 density 0.00000 linear 20.0000 1000.00 color 1.00000 1.00000 1.00000 0.00000 group_end 2 EOF