Cumulative distribution of GMC mass (M_GMC) in different model variations: SFE1 (royal blue), SFE10 (sky blue), SFE100 (light blue), Rad (red), SN (dark orange), and Nofeed (gray). Each solid line gives the median value of the cumulative mass function and the shaded areas enclose the 25%−75% percentile across the time span 0.4−1 Gyr. We also show the slopes of 1.5 and 2 as dashed black lines for reference.