Planck TT, TE, EE+lowP likelihood primordial power spectrum reconstruction results. Top four panels: reconstruction of the deviation f(k) using four different roughness penalties. As in Fig. 21, the red curves represent the best-fit deviation f(k) and the height and width of the green error bars represent the error and minimum reconstructible width, respectively. For all values of the roughness penalty, the deviations are consistent with a featureless spectrum. Lower three panels: ± 1σ error bars of the three non-PPS cosmological parameters included in the maximum likelihood reconstruction. All values are consistent with their respective best-fit fiducial model values (indicated by the dashed lines).