Cosmological parameter constraints from PlanckTT+τprior for the full multipole range (orange) and for ℓ < 800 (blue) – see the text for the definitions of the parameters. We note that the constraints are generally in good agreement, with the full Planck data providing tighter limits on the parameters; however, the best-fit values certainly do shift. It is these shifts that we seek to explain in this paper. A prior τ = 0.07 ± 0.02 has been used here as a proxy for the effect of the low-ℓ polarization data (with the impact of a different prior discussed later). As a comparison, we also show results for WMAP TT data combined with the same prior on τ (grey).
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