-
D1 origin behind pelvic insertion
D1 ~1/2 size D2distance between pectoral & pelvic 6-9% TLA base 2.5-3 X fin height -
D1 origin behind pelvic insertion
D1 ~1/2 size D2A base 4 X fin height
top edge C with denticle crestdistance between pectoral & pelvic 10-14% TL