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Fig. 3

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Gas density of the interstellar medium for simulations A1 (top) and A2 (bottom) after 0.1 (left) and 1 Myr (right). Physical sizes are 2 × 2 pc (left panel) and 10 × 10 pc (right panel). In the earlier stages of the expansion the shells are compressed and simulation A2 shows sign of thin-shell instabilities. Over time the interaction becomes more adiabatic; the compression of the gas diminishes, and the instabilities disappear.

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