Planck 2018 results
Free Access

Fig. 35.


Polarization angular power spectrum, , for different optical depths, τ, running from τ = 0.04 to 0.07 in steps of 0.01. The thick black line shows the fiducial value τ = 0.056, while the grey shading shows the ±1σ sample variance band for fsky = 0.67.

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