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Fig. 4. Contraction kinetics of two independent datasets from two specimens of
T. wilhelma (A and B), each representing the average of 12
contraction cycles. For calculations, relative contraction extent was used in
order to minimize the influence on changes in the projected area by expansion
and retraction of body extensions. For each contraction cycle included, time
t=0 was set at the state of maximum contraction. In both cases the
absolute values of maximum contraction rates
are higher than the
absolute values of maximum expansion rates
.