Fig. 8. Boxplot of the differences in mean swim speeds (in m s^–1) between the `descent' and the `ascent' of dives to 40 m and to 80 m for each seal. ^*Mean swim speed significantly higher on the `descent' (paired t-tests, P<0.05). The bottom and top of each box marks the 25th and 75th percentile, respectively. The black and grey lines within the box represent the median and mean, respectively. Whiskers above and below the box indicate the 90th and 10th percentiles.