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The exact sharing probabilities (Y-axis) as a function of variant allele frequency (x-axis), for a pair of first cousins (1), a pair of second cousins (2), three first cousins (3) and three second cousins (4). The sharing probabilities calculated under the assumption of ‘no IBS without IBD’ are 1/15, 1/63, 1/85 and 1/745, respectively, and indicated by the dashed horizontal lines
