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. 2007 Oct 31;2(10):e1086. doi: 10.1371/journal.pone.0001086

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van Hooft 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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Error bars: standard error (), except for the two lowest data points in which the haplogroup was observed only once or twice. Here they correspond to a chance ≥84% of sampling ≤1 or 2 (positive error bar) or ≥1 or 2 haplogroups (negative error bar). Years of birth 1987, 1990, 1992 and 1994 consist of pooled years because of the small sample size (with the x axis corresponding to the average year of birth). Years of birth were pooled with similar amounts of rainfall in the preceding three years (difference<69 mm/year).

Inline graphic — Error bars: standard error (), except for the two lowest data points in which the haplogroup was observed only once or twice. Here they correspond to a chance ≥84% of sampling ≤1 or 2 (positive error bar) or ≥1 or 2 haplogroups (negative error bar). Years of birth 1987, 1990, 1992 and 1994 consist of pooled years because of the small sample size (with the x axis corresponding to the average year of birth). Years of birth were pooled with similar amounts of rainfall in the preceding three years (difference<69 mm/year).