% comments like this are ignored
5 5 10 -1 0
0 0 2.43872
2 0 0.724062
4 0 0.281634
1 1 4.21742
%
% so are blank lines
2 1 1.69463
3 1 1.23492
2 2 4.77818

3 2 0.902819
3 3 3.51267
4 4 6.25922