Posteriors on τ obtained from cross-spectra between the 100 and 143 GHz channels; only the polarized synchrotron-tracer handling is changed among the three cases. From top to bottom we use: 30 GHz to clean 100 GHz only; 30 GHz to clean both 100 and 143 GHz; and WMAP K band to clean 100 GHz only. Intense and fainter bars show 68% and 95% confidence levels, respectively. The vertical line shows the best-fit value from the default analysis.
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