Comparison between statistical properties of three IRIS datasets, representing quiet sun and network regions, and the MURaM-ChE model. Panels (a), (b), (d), and (e) show distributions of k₂ brightness temperature and peak separation. Panels (c) and (f) show average profiles of the Mg II k line. In panels (a–c) we compare results from the first IRIS dataset "IRIS QS 1" considering the full FOV together with smaller ROIs of roughly the size of the simulation domain with the results from the MURaM-ChE model. In panels (d–f) we compare three IRIS datasets considering the whole FOVs together with results from the MURaM-ChE model.