A reanalysis of Planck HFI polarization with the improved SRoll2 map-making yields tau = 0.0566 (+0.0053 / -0.0062) from large-scale EE data alone, and tau = 0.059 ± 0.006 in combination with Planck temperature and high-l polarization, the tightest constraint to date.
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Reionization optical depth determination from Planck HFI data with ten percent accuracy
A reanalysis of Planck HFI polarization with the improved SRoll2 map-making yields tau = 0.0566 (+0.0053 / -0.0062) from large-scale EE data alone, and tau = 0.059 ± 0.006 in combination with Planck temperature and high-l polarization, the tightest constraint to date.