Comparison between the models with the average stellar mass growth from van Dokkum et al. (2013). The models used here use free infall and high ω. We also show the median line of 24 runs where we bootstrapped the data. The variation from the minimum value to maximum value in each time-step is shown as the light coloured region around each line. ± the standard deviation is shown as the darker coloured region around each line. The black lines show how different values of the disc radial scale length –used to convert the stellar mass to the local stellar surface density– affect the van Dokkum et al. (2013) fit. The dotted line, dashed line and dot-dash line use R_scale = 2.1, 2.4, 1.8 kpc. These values are taken from Porcel et al. (1998).