x y           z           x_rsum x_delta x_counter y_rsum      y_delta    y_counter z_rsum      z_delta     z_counter
1 10.10000000 20          1      0       1         10.10000000 0          1         20          0           1
2 10.20000000 30          3      1       2         20.30000000 0.10000000 2         50          10          2
3 10.30000000 40.80000000 6      1       3         30.60000000 0.10000000 3         90.80000000 10.80000000 3
