Constraints on ionization fraction during reionization. The allowed models, in terms of zre and Δz, translate into an allowed region in xe(z) (68% and 95% in dark blue and light blue, respectively), including the zend> 6 prior here. Left: constraints from CMB data using a redshift-symmetric function (xe(z) as a hyperbolic tangent with δz = 0.5). Centre: constraints from CMB data using a redshift-asymmetric parameterization (xe(z) as a power law). Right: constraints from CMB data using a redshift-symmetric parameterization with additional constraints from the kSZ effect.
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