bin_lo     bin_hi     x_count y_count
0.00000000 1.00000000 8       1
1.00000000 2.00000000 2       2
2.00000000 3.00000000 5       5
3.00000000 4.00000000 4       1
4.00000000 5.00000000 3       2
5.00000000 6.00000000 1       4
6.00000000 7.00000000 3       4
7.00000000 8.00000000 2       4
8.00000000 9.00000000 2       7
