Pearson correlation coefficient for T and E. The red curve is the theoretical best-fit to the PlanckTT, TE, EE+lowP data. The blue points are the binned Planck data described in this paper. Data points with negative values for EE, or low S/N in polarization (specifically S/N< 1) are omitted, which leads to an apparent bias between the theory curve and the data at the highest multipoles. The error bars here are calculated assuming a Gaussian distribution for the TT, TE, and EE power values, which should be a reasonable approximation at high ℓ. The Pearson coefficient is also normally distributed at high ℓ.