Side view of the computational domain showing coronal emission. Left two panels: emission as it would be seen by the 171 Å channel of AIA starting from around 1 MK. Two right-hand panels: X-ray emission as seen by XRT sampling higher temperatures. Here we show snapshots of the two more active models, runs 10B and 20B. The emission here is integrated along the y direction which corresponds to an observation near the limb (of the Sun or a star). The snapshot is taken at t = 230 min; i.e., in the relaxed state. See Sect. 4.2.