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The probability of the truly associated marker being included among the top 6.7% of the markers when the number of disease-associated markers is 
. The sample size is 
, the error rate is 
, and the number of pools formed for either the cases or the controls is 
. From top to bottom, the curves correspond to allele frequency differences of 0.10, 0.07, 0.05, 0.03, and 0.01, respectively.
