Constraints on n_s vs. r at k_∗ = 0.002 Mpc^-1 for the inflationary models considered (i.e., power law potentials with n = 2 / 3,1,2, and 4, natural inflation, and hilltop inflation), showing joint 68% and 95% CL. Blue and grey distributions correspond to the restrictive and permissive entropy generation scenarios, respectively. The instantaneous entropy generation case corresponds to the thin (red) contours in the natural and hilltop panels; for the single parameter models, this case corresponds to the lowest-r extremity of the restrictive case. The difference between the natural inflation region in Fig. 1 and the natural inflation constraints shown here is due to the strong projection effect described in the text.