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Fig. 3. Examples of P. americana males tracking female pheromone upwind
(direction right to left) in a wind tunnel illustrated with the time-averaged
plume boundaries of titanium tetrachloride smoke visualization of the plumes
as they track in 25 cm s-1 wind. Each circle represents the body
position every 0.083 s. Details of the time-averaged plume envelopes as per
Fig. 1.