Fig. 2.

(A–D) Normalized swimming speed $\overline{v}/{\overline{v}}_0$ (black circles) and body angular speed $\overline{\mathrm{\Omega }}/{\overline{\mathrm{\Omega }}}_0$ (red squares) vs. dialyzed PVP concentration (in weight percent) at four molecular weights, with ${\overline{v}}_0\approx 15\hspace{0.17em}\mu \mathrm{m}/\mathrm{s}$ and ${\overline{\mathrm{\Omega }}}_0\approx 20\hspace{0.5em}\mathrm{Hz}$. Top axis: PVP concentration normalized to c*. The blue stars in A are the swimming speeds from SD (14) normalized to the values at their lowest polymer concentration.