Fig. 6. Differences in spectral electroretinograms of weakfish and spotted
seatrout, calculated by subtracting the weakfish spectral sensitivities
(Sweakfish) from those of spotted seatrout
(Sspotted seatrout). Open symbols are day values, filled
symbols are night values. Dashed gray lines are ±95% CI, calculated as
1.96* (s.e.m.). Significant differences occurred when CI did not
encompass zero.