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Fig. 4. Jet-and-sink behavior for a squid with an estimated mantle length of 18.55 mm for a 3.5 s video sequence [movie 3, jet_sink; available at supplementary material; video footage ©2000 MBARI]. (A) The vertical position of the mantle tip within the frame (y coordinate of pixel). (B) The velocity of the squid in each frame. (C) Mantle diameter (mm). In B and C, pixels are converted to m s–1 and mm via the allometry regression of Fig. 7A. Increases in velocity and vertical position corresponds to mantle contractions (arrows), with the greatest increase in vertical position and velocity, and the smallest mantle diameter, at time 1.4 s.





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