Fig. 7. The critical velocities of normalized area (U_crit,a), the velocity at which area reaches within 5% of the minimum area, versus the critical velocity of drag coefficient (U_crit,C), the velocity at which C_D reaches within 5% of the minimum C_D. The line is unity. Note that most species fall below the line, indicating that C_D asymptotes at a lower velocity than normalized area for those species. Species labeled as per Fig. 4.