Ejecta properties computed by heracles for model r1w1h (model with a weak wind but an extended atmospheric scale height) at 1, 2, and 8 d after the start of the heracles simulation. Compared to model r1w6, the shock is not as strongly decelerated by the atmosphere (which has a steep density profile) and the photosphere remains close to the fast-moving ejecta, inhibiting the formation of a long-lived shock breakout signal.