K,ser_mask
1,0.9967928683
3,0.9934662748
10,0.9869523182
30,0.9769415244
100,0.961966217
300,0.9457608404
1000,0.9257560018
3000,0.8881725568
10000,0.8471349462
30000,0.8132026814
65536,0.790006818
100000,0.7797171991
300000,0.7435325695
1000000,0.7188559867