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Fig. 4. Box and whisker plots of visual sensitivity thresholds (trial setting of
threshold response and corresponding intensity levels) across three testing
groups: males (gray, N=22); females in a non-reproductive state
(white, N=20) and reproductive state females (cross-hatched;
N=12). The center horizontal line marks the median of the sample, and
the length of each box shows the range containing 50% of all values with the
box edges representing the first and third quartiles. The open circles
represent far outside values or outliers (>first or third quartile ±
3xinterquartile range). Each group includes data from individuals
obtained on their initial test only. *P<0.05.