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. 2015 May 29;10(5):e0127538. doi: 10.1371/journal.pone.0127538

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© 2015 Li 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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Fig 6 — Lateral axis represents the sample size; vertical axis represents the I² value. Boxes represent the distribution of I² variations in synthesizing different number of trials (the sample size of each trial is the same). To each Si, sampling process will be repeated in 1000 times.