The data_xi has this values :
0.00000000
7.00000003E-02
0.730000019
1.42999995
3.41000009
6.01000023
7.32000017
7.59000015
7.67999983
7.76999998
7.80999994
7.88000011
7.90999985
7.92000008
And data_yi:
745.000000
744.000000
736.000000
729.000000
696.000000
615.000000
460.000000
331.000000
258.000000
187.000000
151.000000
98.5999985
67.5999985
46.4000015