JEB -- Duncan and Byrne 205 (16): 2489 Figure IG6

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Fig. 6. Simultaneous recordings of CO₂ and O₂ exchange from the right and left mesothoracic spiracles of an individual Circellium bacchus (mass 8.455 g). The small amount of CO₂ detected from left spiracle is probably due to slight cross-sampling of the right spiracle.