Zoomed-in view of the snapshot of the 2D run with α = 2 × 10⁻³ at time t = 150 ω_T⁻¹ showing the spatial correlation between $\stackrel{\sim }{\beta }$ and σ. In the inset we separately show regions with low (left column) and high (right column) thermal diffusivity by cutting out regions where χ/χ₀ is above 0.05 and below 0.2, respectively. In the second row of the inset, left column, the magnetic field lines are shown in blue. With whistler suppression, regions of high thermal conductivity are shaped as thin bundles near filaments of strong magnetic fields and act in a similar way as Autobahns for the heat-carrying electrons.