Efficiency assessment of the WMAP approach for transmission imbalance error propagation. The left and right sections of the figure correspond to Stokes Q and U parameters, respectively, while rows show different DAs. Within each section, the left panel shows the raw difference between the WMAP9 and COSMOGLOBE DA maps, while the middle panel shows the best-fit WMAP transmission imbalance template combination; the right panel shows the difference between the two. Only one template amplitude is fit for both Q and U.