Taylor expansion of the full V(ϕ) at order n = 3 and 4, trusted until the end of inflation, in natural units (where ). The parameters are the Taylor coefficients with flat priors. Dashed contours are Planck TT,TE,EE+lowE, while solid contours are Planck TT,TE,EE+lowE+lensing+BK15.
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