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GATK VCF PL field ordering for pooled/polyploid samples
I am using GATK UnifiedGenotyper 2.3-9 for a set of pooled samples. I am uncertain about the order of PL values in polyploid samples, as it wasn't defined in VCF v4.1 specifications. The ordering formula described in VCF v4.1: F(j/k) = (k*(k+1)/2)+j only applies to diploid case. May I know how GATK extended the ordering formula to handle polypoid samples?
Example VCF line:
Thank you very much!