Fig. 2.

Densities of the log transformed value of the ratio between the standard deviation and the absolute mean of their 5 estimated quantile coefficients ${\beta }_{jk,\tau }$s for eQTLs identified at 5% FDR in four tissues. In legend, QRank-LR stands for the SNP–gene pairs that were identified by QRank but missed by LR, and QRank & LR stands for the SNP–gene pairs identified by both approaches. The QRank-LR eQTLs are more heterogeneous than the QRank & LR eQTLs