Files in this Data Supplement:

• Movie 1 -

  Movie 1. 2D simulation of the reference motion pattern.

  The movie shows vorticity contours and velocity field of the 2D anguilliform swimmer at its asymptotic swimming velocity. The camera is following the center of mass of the body.

• Movie 2 -

  Movie 2. Comparsion of the efficient swimming versus the reference swimming mode.

  The movie shows the mid-line of the body for the efficient swimming mode (blue) and the reference swimming mode (black).

• Movie 3 -

  Movie 3. Comparsion of the efficient swimming versus the burst swimming mode.

  The movie shows the mid-line of the body for the efficient swimming mode (blue) and the burst swimming mode (red).

• Movie 4 -

  Movie 4. Flow field in the mid-plane of the efficient swimming mode.

  The movie shows contours of vorticity normal to the image plane and the velocity field in the mid-plane as the body swims at its asymptotic swimming velocity. The camera is following the center of mass of the body.

• Movie 5 -

  Movie 5. Flow field in the mid-plane of the burst swimming mode.

  The movie shows contours of vorticity normal to the image plane and the velocity field in the mid-plane as the body swims at its asymptotic swimming velocity. The camera is following the center of mass of the body.

• Movie 6 -

  Movie 6. Wake structure of the efficient swimming mode.

  The movie shows isosurfaces of vorticity magnitude ||ω||≡2 as the body swims at its asymptotic swimming velocity. The camera is following the center of mass of the body.

• Movie 7 -

  Movie 7. Wake structure of the burst swimming mode.

  The movie shows isosurfaces of vorticity magnitude ||ω||≡2 as the body swims at its asymptotic swimming velocity. The camera is following the center of mass of the body.

• Movie 8 - Movie 8. Formation of secondary flow structures in the efficient swimming mode.

  The movie shows isosurfaces of longitudinal vorticity |ω_x|≡1produced by the lateral motion of the body in the course of one undulation cycle. The camera is following the center of mass of the body.

• Movie 9 - Movie 9. Formation of secondary flow structures in the burst swimming mode.

  The movie shows isosurfaces of longitudinal vorticity |ω_x|≡1produced by the lateral motion of the body in the course of one undulation cycle. The camera is following the center of mass of the body.

• Movie 10 - Movie 10. Closeup view of the vortex structure in the wake of the efficient swimming mode.

  The movie shows isosurfaces of vorticity magnitude ||ω||≡2 colored by local contours of lateral vorticity ω_y as the body swims with its asymptotic swimming velocity. The camera is following the center of mass of the body.

• Movie 11 - Movie 11. Closeup view of the vortex structure in the wake of the burst swimming mode.

  The movie shows isosurfaces of vorticity magnitude ||ω||≡2 colored by local contours of lateral vorticity ω_y as the body swims with its asymptotic swimming velocity. The camera is following the center of mass of the body.