Samples from the Planck TT+lowP posterior in the ∑ mν–H0 plane, colour-coded by σ8. Higher ∑ mν damps the matter fluctuation amplitude σ8, but also decreases H0. The grey bands show the direct measurement, H0 = (70.6 ± 3.3) km s-1Mpc-1, Eq. (30). Solid black contours show the constraint from Planck TT+lowP+lensing (which mildly prefers larger masses), and filled contours show the constraints from Planck TT+lowP+lensing+BAO.