group_start 0 type 1 density 0.1000000 linear 1.00000 100.000 color 3.00000 3.00000 2.80000 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 1 density 1.00000 linear 0.00000 60.0000 color 1.00000 1.00000 1.00000 0.00000 group_end 2 EOF