Eigen-modes of the recombination history, marginalized over the standard six cosmological and Planck nuisance parameters. The upper panel shows the first three Xe-modes constructed for Planck TT,TE,EE+lowP data. The lower panel show changes in the differential visibility corresponding to 1σ deviations from the standard recombination scenario for the first three Xe-modes. The maximum of the Thomson visibility function and width are indicated in both figures.
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