As in Figure 6 for a parallel shock with M = 80, at , when E_max ≈ 100E_sh (Run D). The magnetic field is significantly more amplified than in the M = 20 case, with in the precursor a factor of about 10 larger than in Figure 6. Note that the resonance at E_max (dot-dashed line) is calculated in B₀: accounting for the amplified field would shift the resonance at higher k.