Stability curves for photoionized gas with Solar abundance, nH = 1010 cm-3 and NH = 1023 cm-2 being illuminated by the Soft and the Hard SEDs. A part of the Hard stability curve is highlighted in thick grey; this is the negative slope part of the curve and corresponds to unstable thermodynamic equilibrium. Gas with log ξ in this part of the curve is unlikely to exist in nature. The Soft curve is stable in the relevant part (log T ≥ 5.5). We note that both curves have a part with negative slope at log T ≲ 5.0. However, this part of the stability curve has very low values of log ξ ( < 2.0), which are not relevant for gas around BHBs.
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