ABOUT THIS IMAGE. This image shows the maximal value of the
r2 statistic for linkage disequilibrium as a function of allele
frequencies at two biallelic loci.
The plot has symmetries corresponding to interchanging the alleles
at a locus, or interchanging the two loci. The maximum drops quickly
as frequencies at the two loci diverge from each other. The figure is
taken from the work of VanLiere & Rosenberg (Mathematical properties
of the r2 measure of linkage disequilibrium;
Theoretical Population Biology 74: 130-137, 2008).
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