Fig. 7. Relative differences (a–b) 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.