x y    z    x_rsum x_delta x_counter y_rsum             y_delta             y_counter z_rsum z_delta            z_counter
1 10.1 20   1      0       1         10.1               0                   1         20     0                  1
2 10.2 30   3      1       2         20.299999999999997 0.09999999999999964 2         50     10                 2
3 10.3 40.8 6      1       3         30.599999999999998 0.10000000000000142 3         90.8   10.799999999999997 3
