Marginalized posterior distributions for ∑ m_ν in flat models from CMB data. We show results for Planck+WP+highL without (solid black) and with (red) marginalization over A_L, showing how the posterior is significantly broadened by removing the lensing information from the temperature anisotropy power spectrum. The effect of replacing the low-ℓ temperature and (WMAP) polarization data with a τ prior is shown in solid blue (Planck−lowL+highL+τprior) and of further removing the high-ℓ data in dot-dashed blue (Planck−lowL+τprior). We also show the result of including the lensing likelihood with Planck+WP+highL (dashed black) and Planck−lowL+highL+τprior (dashed blue).