Posterior distribution for the tensor-to-scalar ratio (at k = 0.002 Mpc^-1) and for the running parameter dn_s/ dlnk (at k = 0.05 Mpc^-1), for the potential reconstructions in Sects. 7.2 and 7.3. The V(φ) reconstruction gives the solid curves for Planck TT+lowP+BAO, or dashed for TT, TE, EE+lowP. The H(φ) reconstruction gives the dotted curves for Planck TT+lowP+BAO, or dashed-dotted for TT, TE, EE+lowP. The tensor-to-scalar ratio appears as a derived parameter, but by taking a flat prior on either ϵ_V or ϵ_H, we implicitly also take a nearly flat prior on r. The same applies to dn_s/ dlnk.