1/2
13|20
0.332
0.292
0.875
0.855
5/8
11|18
0.397
0.353
1.0625
1.0375
3/4
10|16
0.462
0.414
1.25
1.225
7/8
9|14
0.526
0.474
1.4375
1.4075
1
8|12
0.59
0.534
1.625
1.595
1-1/8
7|12
0.655
0.595
1.8125
1.7825
1-1/4
7|12
0.782
0.718
2
1.955
1-3/8
6|12
0.846
0.778
2.1875
2.1425
1-1/2
6|12
0.911
0.839
2.375
2.33
1-3/4
5
1.04
0.96
2.75
2.69
2
4.5
1.169
1.081
3.125
3.065