Neutrino mass profile likelihood for the CMB (red), CMB+lensing (blue), and CMB+lensing+BAO (green) data sets. Each point is the result of a 37-parameter fit which can only be computed in the positive region. The points are fit by a parabola and extrapolated into the negative region. For the CMB only case, the parabolic fit agreement is poor and is only shown for discussion. The coloured green/blue lines are used to set 95% confidence upper limits according to the Feldman-Cousins prescription, as described in the text.
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