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Planck 2015 results
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Fig. 19

image

Marginalized constraints on parameters of the base ΛCDM model without low-E-mode polarization (filled contours), compared to the constraints from using low-E-mode polarization (unfilled contours) or assuming a strong prior that reionization was at zre = 7 ± 1 and zre> 6.5 (“reion prior”, dashed contours). Grey bands show the constraint from CMB lensing alone.