a   b   i  x          y          i_shift_lead
pan pan 1  0.34679014 0.72680286 2
eks pan 2  0.75867996 0.52215111 3
wye wye 3  0.20460331 0.33831853 4
eks wye 4  0.38139939 0.13418874 5
wye pan 5  0.57328892 0.86362447 6
zee pan 6  0.52712616 0.49322129 7
eks zee 7  0.61178406 0.18788492 8
zee wye 8  0.59855401 0.97618139 9
hat wye 9  0.03144188 0.74955076 10
pan wye 10 0.50262601 0.95261836 -
