As in Figure 3, now considering the R8 Arm model. The blue distribution represents a two-dimensional histogram of the equipartition magnetic field strength, B_eq, compared to the simulated, mass-averaged magnetic field strength, B_avg. The best-fit power law to this distribution is included as a purple line with ﹩{B}_{{\rm{eq}}}\propto {B}_{{\rm{avg}}}^{0.45}﹩. The black, dashed line represents B_eq = B_avg. The red points represent the values of B_eq and B_avg averaged over the full simulation snapshots. The green points represent the averages over nonoverlapping, 1 kpc scale patches of each snapshot.