Star formation rate per unit surface area as a function of radius for the MUGS galaxy g15784 (upper-left panel) and the RaDES galaxy Apollo (upper-right panel). We show the simulations at four different redshifts: z = 0.0, 0.5, 1.2, and 2.2, as noted in the inset to the upper-right panel. 1 kpc annuli are used along with a height cut of  ± 5 kpc above and below the disk. The mass of stars formed in the last 100 Myr is calculated for each annulus out to a radius of 15 kpc. The curves have been normalised to 1 M_⊙/Gyr/pc² at galactocentric radius 8 kpc. The bottom panels show the corresponding predicted behaviour of the Chiappini et al. (2001) (right) and Mollá & Díaz (2005) (left) models. Only redshifts 0.0 and 2.2 are shown, other redshifts are excluded as these models evolve smoothly from z = 2.2 to z = 0.0. Two of the Mollá & Díaz (2005) models are shown, one with high star formation efficiency (dashed lines) and one with low star formation efficiency (solid lines).