Cutoff energy and phase lag as a function of τ_∥ without (filled symbols) and with an acceleration zone (open symbols). Each point represents a calculation with different τ_∥ and γ_min. The horizontal dotted lines bracket the ranges of observed values as in Motta et al. (2009) for E_c and Altamirano & Méndez (2015) for φ_lag. The vertical dot-dashed lines show the range in τ_∥ (hence in γ_min also, see text) where the two quantities simultaneously cover the entire observed ranges.