Planck 2015 results
Free Access

Fig. 9


Constraints on the reionization optical depth, τ. The dashed black curve is the constraint from Planck CMB (i.e., TT,TE,EE+lowP), while the three coloured lines are the posterior distribution on τ from a joint analysis of the cluster counts and Planck TT only for the three different mass bias parameters.

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