Fig. 4. Mean profiles of scaled fluid speed along the centerline transect for each of the nine individuals (broken red lines), in addition to a polynomial fit for the pooled data set (blue line). The deviations of individual profiles from the mean profile (averaged over all individuals) were small (average residual=3% of the speed at gape±0.7%) and not significantly correlated with size. Scaled fluid speed is fluid speed relative to flow speed at gape distance from the mouth, whereas scaled distance is the distance in gape diameters.