Top panel: Transverse magnetic fields B_⊥ for runs I4, C4, I10, and C10 in Table 2. Inset: ﹩{({B}_{\perp }/{B}_{0})}_{{\rm{sat}}}﹩ vs. ξ_eff, modeled with Equation (17) (gray dashed line) for the runs with squares of respective colors. Bottom panel: CR distributions for PLI:50-400:10⁻³. During saturation, roughly all the higher-energy CRs isotropize, efficiently contributing to the saturated field (in the absence of the lower-energy ones).