Luminosity (in units of ΙΟ³⁸ erg s⁻¹) plotted against the EUV flux (EF_E in units of 2 × 10³⁶ erg s⁻¹ at 100 eV) for the simulation of Sect. 3.2 shown in Fig. 6. The mean location of spectral states are marked as follows: HAR = hard, SNT = soft nonthermal, INT = intermediate, US = ultrasoft, and VH = very high. The histogram on the left (thick solid line) shows the relative number of days spent at fixed luminosity. The dashed line shows L_eqpair.