Comparison between runs CygX1 (red), CygX1_T7 (blue) and CygX1_T9 (magenta). Probability density function of the temperature at t = 4000 s (full lines) and t = 10 000 s (dash-dotted lines). In the early stages, CygX1 and CygX1_T7 are indistinguishable from each other, while CygX1_T9 is slightly hotter and more of its volume is hotter than ∼5 × 10⁹ K. In the mixing phase, the temperature repartition is more in line with the injected temperature.