P-P plot of SNP level results. p values of correlation among couples are plotted for all SNPs as a function of the normal distribution. The black line is equal to the expectation on H0. Overall, the data follows the normal distribution with an excess in the tail at p < 10-4.
Khankhanian et al. BMC Genomics 2010 11:626 doi:10.1186/1471-2164-11-626