Angular correlation function measured with Planck (dark solid curve) (Planck Collaboration XII 2014), and associated 1σ errors(grey), compared with the prediction of the conventional inflationary Λ CDM (blue). In this model one assumes that u_min = 0 and then optimizes C₂ using the power spectrum in Fig. 1. The red curve shows the prediction of truncated inflation, or a non-inflationary cosmology, with an optimized lower limit u_min = 4.34 and C₂ = 235.14.