Top panel: size distribution in the envelope for the case with sonic turbulence and c_d = 0. The different curves correspond to different amounts of time and different CR rates (see legend at top). Time is expressed in terms of τ_cl for each different CR ionization rate. τ_cl(0.1ζ_P18), τ_cl(ζ_P18), and τ_cl(10ζ_P18) are the cloud lifetimes, evaluated assuming CR ionization rates of 0.1ζ_P18, ζ_P18, and 10ζ_P18, respectively, where ζ_P18 is the ionization rate calculated from Padovani et al. (2018). In the case of c_d = 0 (top panel) the curves at different times are nearly independent of the ionization rate and the curves overlap nearly perfectly (i.e., only one curve is visible for each time). Middle panel: without turbulence, but assuming c_d = 1. Bottom panel: shown in blue is the peak of the distribution as a function of time (assuming ζ = ζ_P18, c_d = 0, and v_g = c_s), and in orange the approximation given by Eq. (23).