0 500 30 1 2 0.5 0.05 0.5 0.0005 0.005 1 0 2000 Distance over flat ground. 0 0 1 0 0 0 0 0 0 0 0 7 16 17 18 19 20 21 22 13 0 1 3 4 5 6 7 8 9 10 11 12 13 7 16 17 18 19 20 21 22 4 0 1 2 4 18 20 100 0