Reconstructed primordial scalar power spectrum derived using Planck TT,TE,EE+lowE+lensing+BK15 data and 12 knots for the cubic spline interpolation (with positions marked as Δ at the bottom of each panel). Mean (ensemble-averaged) spectra are heavy lines, allowed ±1σ and ±2σ regions for trajectories are the shaded regions, and the dashed lines denote selected trajectories with parameters sampled within the ±1σ posterior. Below the scalar power is the tensor power reconstruction. The addition of the BAO likelihood shown in the middle panel makes almost no visual difference to the reconstructions. In the bottom panel, fixing the tensor-to-scalar ratio to r = 0.001 also produces only small differences in reconstruction. Knot positions in k roughly translate to multipoles through kDrec, where Drec is the comoving distance to recombination.
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