a   b   i_sum x_sum               y_sum
pan pan 1     0.3467901443380824  0.7268028627434533
eks pan 2     0.7586799647899636  0.5221511083334797
wye wye 3     0.20460330576630303 0.33831852551664776
eks wye 4     0.38139939387114097 0.13418874328430463
wye pan 5     0.5732889198020006  0.8636244699032729
zee pan 6     0.5271261600918548  0.49322128674835697
eks zee 7     0.6117840605678454  0.1878849191181694
zee wye 8     0.5985540091064224  0.976181385699006
hat wye 9     0.03144187646093577 0.7495507603507059
pan wye 10    0.5026260055412137  0.9526183602969864
