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Fig. 9. Boxplot of the differences in the number of peaks between the `ascent' and
the `descent' for dives to 40 m and to 80 m for each seal. *Number
of strokes significantly higher on the `ascent';
number of
strokes significantly higher on the `descent'; NS, not significant (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.