X-ray luminosity as a function of emission-measure-weighted thermal energy kТ_av (left panel) and the kTs and EMs (right panel). The EMDs used for these grids assume the same magnetic structures and the same percentage coverage as in Fig. 3, with the difference that each EMD is scaled to a larger extension of the corona of Kepler-63, i.e. the stellar radius is set to be 30% larger. The coding of the plots follows Fig. 3.