a   b   i  x          y          i_shift_lead i_2_1
eks pan 2  0.75867996 0.52215111 4            3.00000000
eks wye 4  0.38139939 0.13418874 7            4.33333333
eks zee 7  0.61178406 0.18788492 -            4.33333333
hat wye 9  0.03144188 0.74955076 -            9.00000000
pan pan 1  0.34679014 0.72680286 10           5.50000000
pan wye 10 0.50262601 0.95261836 -            5.50000000
wye wye 3  0.20460331 0.33831853 5            4.00000000
wye pan 5  0.57328892 0.86362447 -            4.00000000
zee pan 6  0.52712616 0.49322129 8            7.00000000
zee wye 8  0.59855401 0.97618139 -            7.00000000
