Fig. 5. Pseudo-three-dimensional view of the wake, showing the x and y positions of vortices detected at the tip of the caudal fin, with time as the third axis. This view is representative of the streamwise vortices in the wake if the vortices did not evolve over time or interact with each other. The sheet swept out by the caudal fin is shown in gray. Identified vortices are colored by circulation, while vortices that were detected but whose source could not be determined are shown with shades of gray representing circulation. Vortices shed by the caudal fin, including the two tip vortices and the caudal notch vortices, have a black mesh, while the outer dorsal and anal fin vortices have a white mesh.