Fig. 3. Total near-surface drag (sum of wave, pressure and friction drags) measurements for body orientation angles of 0°, 20°, 45° and 90° for dorsal side up (A) and inverted (B) posture for water velocities of 0.38 m s^–1 (open squares), 0.47 m s^–1 (open diamonds), 0.55 m s^–1 (open triangles) and 0.63 m s^–1 (crosses). Values are means ± 2 s.e.m. For N values, see text. In all cases, r²>0.9, P<0.05.