Vertically integrated and mass-averaged quantities from one snapshot of the R8 simulation. From left to right, the four panels show synchrotron intensity (I_ν) at 1.5 GHz (Equation (3)), the vertical mass-weighted average of total CR energy density (e_c,avg), the vertical mass-weighted average magnetic field strength (B_avg), and the traditional equipartition estimate of the magnetic field strength (B_eq) as determined by Equation (15) from the synchrotron intensity. We can see that e_c,avg is nearly constant spatially while B_avg has much greater variation. Therefore, the spatial distribution of I_ν primarily traces B_avg, and the traditional equipartition estimate fails at small scales.