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Fig. 2. Experimental setup. A crayfish is suspended above the treadmill (TM). A
lasersheet is generated by a laser (L). A PIV camera is set to the position C1
(C2) and the lasersheet is aligned along the plane LS1 (LS2) to measure the
two components of velocity field in horizontal (vertical) planes (blue broken
boxes). A video camera (VC) is used to monitor the crayfish fanning
activity.