Time evolution of the stellar mass surface density profiles for the disk of NGC 300. Different line types represent the radial profile of stellar mass surface density at 3.5 Gyr (dotted lines), 8.5 Gyr (dot-dashed), 12.5 Gyr (dashed lines), and 13.5 Gyr (solid lines). The observations are from Fig. 7 of Gogarten et al. (2010), and the data have been offset from one another to avoid overlapping error bars.