Figure 2: QQ plots for genes (gTDT results) in chromosome 1 from 116 parent-offspring trios from the autism study and only genotypes with GQ > 5 are used.
From: The impact of genotype calling errors on family-based studies

The 95% point-wise confidence band (gray area) is computed under the assumption of the p-values being drawn independently from a uniform [0, 1] distribution. (A) Variant calling was carried out by GATK best-practice pipeline with different depths; (B) Variant calling was carried out by GATK best-practice pipeline, Beagle4 and Polymutt with the same depth of 6x.