Large version of So BC Coast: area = 130000 km^2, rug = 164m.
Runs from Skeena River (just past NW corner) to Fraser River (visible in
SE corner). Cutoff at Skeena is mainly for calculational convenience.
Does not include Vancouver Island.
Medium version of So BC Coast: area = 105000 km^2, rug = 176m.
Small version of So BC Coast: area = 64000 km^2, rug = 194m.
