EE cross-spectra for WMAP × 70, WMAP × 100, and WMAP × 143. The error bars shown are based on MC simulations. The sky fractions used are 57% for WMAP × 70 and 48% for both WMAP × 100 and WMAP × 143. For reference we also plot the 100 × 143 cross-spectrum. The black line shows a theoretical power spectrum for a model with τ = 0.05.
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