Rotational dependency of the growth rate λ, the peak spectral magnetic field , and the maximum of the Fourier-filtered vertical magnetic field for various averaged imposed magnetic field strengths B₀/B_eq0 = 0.026 (blue line), 0.066 (red), 0.14 (green), 0.28 (cyan), and 0.85 (black). Error bars denote either the errors of the exponential fit (λ; see Table 2), or are estimated as 10% of the actual value.