Planck 2015 results
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Fig. 17


Primordial spectra (scalar and tensor) of the best-fit V(φ) model with n = 4, for the Planck TT, TE, EE+lowP data set, compared to the primordial spectrum (scalar only) of the best-fit base ΛCDM model. The best-fit potential is initially very steep, as can be seen in Fig. 15 (note the typical shape of the green curves). The transition from “marginal slow roll” (ϵV(φ) between 0.01 and 1) to “full slow roll” (ϵV(φ) of order 0.01 or smaller) is responsible for the suppression of the large-scale scalar spectrum.

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