a   b   i x          y
pan pan 1 0.34679014 1.72680286
eks pan 2 0.75867996 2.52215111
wye wye 3 0.20460331 3.33831853
eks wye 4 0.38139939 4.13418874
wye pan 5 0.57328892 5.86362447
zee pan 6 0.52712616 6.49322129
eks zee 7 0.61178406 7.18788492