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. 2013 Mar 26;8(3):e60167. doi: 10.1371/journal.pone.0060167

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© 2013 Bertossa et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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τ values are indicated for all strains used in N. giraulti (A), N. longicornis (B), and N. vitripennis (C). Circles (o) and crosses (+) are used to distinguish τ values in DD an LL, respectively. Significant differences (among strains within each sex, and between sexes within each strain) are indicated in the top panels with asterisks (* = p<0.05; ** = p<0.01; *** = p<0.001). Background is gray for DD and white for LL, respectively. Differences in τ between constant darkness and constant light are always significant. A summary of the data is given in tables 1 and 2.