frac,ser_mask
0,0.9999754167
0.2,0.9977270833
0.4,0.9502445833
0.6,0.6829479167
0.75,0.31458375
0.85,0.1250175
0.9,0.09168625
0.92,0.08508416667
0.94,0.07654291667
0.955,0.0716375
0.97,0.06938458333
0.985,0.06607833333
1,0.0636775