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. Author manuscript; available in PMC: 2012 Nov 24.
Published in final edited form as: Nature. 2012 May 16;485(7399):459–464. doi: 10.1038/nature11088
where: r1′ is the first Fisher-transformed correlation coefficient
r2′ is the second Fisher-transformed correlation coefficient
N1is number of common organisms in the first correlation
N2is number of common organisms in the second correlation