Observable range of the best-fit inflaton potentials, when V(φ) is Taylor expanded to the nth order around the pivot value φ∗ in natural units (where assuming a flat prior on ϵV, ηV, , and and using Planck TT+lowP+BAO. Potentials obtained under the transformation (φ−φ∗) → (φ∗−φ) leave the same observable signature and are also allowed. The sparsity of potentials with a small V0 = V(φ∗) is due to our use of a flat prior on ϵV rather than on ln(V0); in fact, V0 is unbounded from below in the n = 2 and 3 results. The axis ranges are identical to those in Fig. 20, to make the comparison easier.
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