Specify the number of columns per individual containing genotype probabilities.
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If "2 (AA AB)" is selected, then probability columns for only genotypes AA and AB are included in the genotype probability file, and it is assumed that the probability of genotype BB is 1 - Prob(AA) - Prob(AB).
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If "3 (AA AB BB)" is selected (the default and the appropriate selection for IMPUTE and BEAGLE), then probabilities for all three genotypes are included and the columns do not necessarily have to sum to 1.
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