Probability densities and marginal distributions with and without external forcing, and with and without whistler suppression. The overall magnetic field strength mainly depends on whether external forcing is included, while the degree of isothermality is almost exclusively affected by whistler suppression. From bottom left clockwise: Two-dimensional probability density as a function of $\stackrel{\sim }{\beta }$ and σ for the MTI run with whistler suppression α = 0.12 and external forcing, marginal distribution over $\stackrel{\sim }{\beta }$, marginal distribution over χ/χ₀, and marginal distribution over the isothermality parameter σ. In the two-dimensional plot the solid purple line denotes the isocontour of 10⁻⁴ for the MTI run without forcing and α = 0.024, which shows approximately the same values of the volume-averaged χ/χ₀.