Evaluation of number of solutions for real data. (A) Number of biologically possible solutions over a range of allele frequencies using a large sample of SNP data (Chr. 17:60 to 60.5 MB, 121 SNPs) from the HapMap project [23,24]. x-axis: allele frequency of SNP1, y-axis: allele frequency of SNP2. Black = more than one solution. Grey = one solution. (B) Comparison of two solutions within the dataset. x-axis: higher value solution, y-axis: lower value solution.