group_start 0 type 1 density 0.00000 linear 10.0000 1000.00 color 1.00000 1.00000 1.00000 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 EOF