18″
18×10 offsets from +10 to +50
18×11 offsets from +23 to +63
18×12 offsets from +36 to +75
19″
19×9.5 offsets from +10 to +50
19×10 offsets from +16 to +56
19×11 offsets from +29 to +69
19×12 offsets from +42 to +82
20″
20×9.5 offsets from +2 to +42
20×10.5 offsets from +15 to +55
20×11 offsets from +42 to +82
20×12 offsets from +34 to +74