Planck 2013 results
Free Access

Fig. 13


Posterior distribution for the Taylor expansion coefficients, Vi, of the inflaton potential. The potential is expanded to nth order, assuming a flat prior on ϵV, ηV, , and . The coefficients Vi are expressed in natural units (where The contours show only half of the allowed regions for potential parameters: the other half is symmetric, with opposite signs for V1 and V3.

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