Polarization Results

We detect correlations between the temperature and polarization maps significant at more than 10 standard deviations. The correlations are inconsistent with instrument noise and are significantly larger than the upper limits established for potential systematic errors. Correlations on small an-gualr scales are consistent with the the signal expected from adiabatic initial conditions. We detect excess power on large angular scales consistent with an early epoch of reionization. A model-independent fit to reionization optical depth yields results consistent with the best-fit ΛCDM model, with best fit value τ = 0.17 ± 0.04 at 68% confidence, including systematic and foreground uncertainties.