Fig. 4. Mean profiles of scaled speed along the centerline transect for each of the three individuals in addition to the polynomial fit to the pooled data set. SS_pooled=0.348x⁴–2.49x³+6.61x²–7.78x+3.56. Error bars represent S.D. of the residuals about the fit lines. Note that all mean profiles fall within the error bars of the fit to the pooled data at all locations measured. Fluid speed at the mouth is somewhere between 3 and 4 times that at gape and fluid speed at a distance of 1.0 gape is approximately 0.25 the speed at gape.