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Fig. 7. Relative differences (ab) between oxygen supply via (a)
meso- and (b) metathoracic spiracles of (A) wing kinematics, (B) power
requirements for flight and metabolic power, and (C) flight efficiency.
Differences are scaled to the flight performance of unmanipulated animals that
could breathe through all thoracic and abdominal spiracles. See text, legends
of Figs 3,
4,
5 and list of symbols and
abbreviations for more explanation.