[MrOblongo]

This might help:

RGB=0-3 lowland0-3
RGB=4-7 midland0-3
RGB=8-11 mount 0-3
RGB=12-15 country0-3
RGB=16-19 city0-3
RGB=20-23 airfield0-3
RGB=24-27 wood0-3
RGB=28-31 water0-3