# x y z density mean mode
1 2 0 2 0 0
1 3 0 8 0 0
3 0 1 7 0 0
3 4 1 42 0 0
0 0 2 1 0 0
1 2 2 4 0 0
1 2 3 5 0 0
2 2 3 6 0 0