Morphological comparison of observation and model. The top panel shows the actual observation of Hi-C (193 Å band). The field of view (124′′ × 62′′) is outlined in Fig. 1 by the dashed rectangle. The bottom panel shows the coronal emission as synthesized from a 3D MHD model for this channel (165 × 109 Mm). The arrows point to features that can be found in both model and observations: a) expanding envelope that consists of several non-expanding loops; b) thin non-expanding threads; and c) rather broad loop-like structures with approximately constant cross section. See Sect. 4.