Snapshot from a two-dimensional simulation captures the interaction between the WR wind and the remnant wind from the earlier RSG phase. The image shows the flow quantities 23.36 kyr after the onset of the WR wind, with the star located at the origin. The top panel shows log₁₀ of gas density (g cm⁻³) according to the colour scale shown, where brighter yellow regions indicate higher density, and darker purples represent lower density. The bottom panel shows log₁₀ of temperature (in K) according to the colour scale displayed beside the plot.