group_start 0 type 1 density 0.100000 linear 20.0000 100.000 color 0.00000 0.00000 0.00000 1.00000 group_end 0 group_start 1 type 1 density 1.00000 linear -5.90000 24.4000 color 0.150000 0.200000 0.300000 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