Temperature distribution shortly before the onset of the kink instability. The upper panel a) shows the temperature distribution in the mid-plane x = 0, while the lower panel b) shows the difference between the temperature distribution shortly before the instability and the initial temperature distribution. Selected magnetic field lines are shown in green in panel a). Light blue lines in panel a) denote cross-sections at which the temperature and density distributions are shown in Figs. 6 and 7. The black dashed lines in panel b) denote ΔT = 0 levels.