Figure 2 from Carlson and friends 2012. Mean ± s.e. relative index (index divided by mean of index) of annual abundance estimates
from 1994 to 2009 for (a) Carcharhinus leucas, (b) Galeocerdo cuvier, (c) Negaprion brevirostris and
(d) Carcharhinus brevipinna in the U.S. coastal fishery in the north-west Atlantic Ocean, based on the
final delta model. Horizontal line is the linear regression fit through year estimates