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r2 r2 = 0.21 Genetic distance [cM] Electronic Supplementary Material Fig. 2 Scatterplot showing the distribution of the intrachromosomal LD-decay parameter r2 in 183 European barley cultivars and plotted against the genetic distance in cM. The horizontal line indicates the 95% percentile of the distribution of unlinked r2, which gives the critical value of r2. Second degree LOESS curve fitted to the plot (black bottom line).