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. 2017 Feb 15;6(4):471–480. doi: 10.1242/bio.023994

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© 2017. Published by The Company of Biologists Ltd

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.

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Fig. 4. — P_Crit determination in adult D. melanogaster. (A) A scatter plot of 11 P_Crit trials (211 females in total). (B) Representative routine V̇O₂ data derived from a single experimental trial of a respirometer containing 17 female flies. Also shown are the values for a respirometer blank. The intersection of the two linear regressions indicates the P_Crit value, identified on the X-axis by the vertical dashed arrow (see text for details of P_Crit calculation and statistics).