Optimal growth rate of the instability as a function of the magnetisation μ. The red diamond markers are the growth rates of the most unstable Fourier mode measured in 2D ideal simulations. The orange and green crosses are those measured in resistive and ambipolar runs. The purple solid line correspond to the model prediction, using the scaling relations (17) and (18). The blue and yellow dashed lines use the same model but with constant η⋆ = 0.01 in both cases and constant αν = 0.1 for the last case.
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