group_start 0 type 1 density 0.300000 linear -50.0000 200.000 color 0.200000 0.800000 0.500000 1.00000 group_end 0 group_start 1 type 1 density 0.00000 linear 0.00000 10.0000 color 1.00000 1.00000 1.00000 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