How the best-fit ℓ <ℓmax PlanckTT+τprior ΛCDM model adjusts as ℓmax is increased from 800 to 2500 (going from the top panels to the bottom panels). Left column: all panels show residuals relative to the ℓ < 800 model. Planck power spectrum binned estimates and ± 1σ errors on the CMB spectrum, as extracted with plik_lite, are shown as grey boxes. Note the change in y-axis scale at ℓ = 500, indicated by the vertical dotted line. The solid black line is the best-fit model for ℓ <ℓmax, where ℓmax is different for each panel, as indicated by which of the boxes are shaded darker. The various coloured lines indicate the linear response to the shift in individual parameters between their ℓ < 800 best-fit value and their ℓ <ℓmax one. Right column: identical to the left column, except that the contribution from θ∗ (i.e., the blue line from the corresponding left panel) has been subtracted from the sums, as well as from the actual model and from the data. For reference, the arrows in the top and bottom panels show the locations of the peaks in the power spectrum.
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