Fig. 3. Profiles of speed (A) and scaled speed (B) measured along the centerline transects for three different feedings of the same individual. (A) The magnitude and shape of the velocity profile are affected both by variation in peak gape (PG) and time to peak gape (TTPG). (B) Data for the same three feedings as in A, in addition to 13 others from this individual, after scaling. Spatial distances are scaled by gape at the time of the velocity measurement. Fluid speeds are scaled by the fluid speed measured at a distance of gape (FS_gape) in front of the fish. A polynomial fit to the data of all 16 feedings is shown as a red broken line (r²=0.986). Error bars represent the S.D. of the residuals about the fit line and are shown at every 0.1 scaled distance. The equation for speed along the centerline from the theoretical model of Muller (1982) is shown as the blue broken line (r²=0.986). Note that although variations in PG and TTPG have a significant effect on the absolute values of speed, the scaled profiles for all transects are very similar to one another.