Figure 17-6. Dependence of RCD (Rate of Change of Direction) 
Upon Direction of Travel with Respect to the Axis of the 
Polarizer for D. Pulex. 
NOTE: (A) in polarized light and (B) in unpolarized light. Data was processed 
by partitioning RCD into disjoint subsets on the basis of the correlated 
direction of travel. The estimated mean (± the standard error of the mean) for 
each subset is indicated in the figures. 
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