Two component fits to the XMM–Newton spectra consisting of an absorbed, Γ= 1.9 power law, and an optically thin thermal plasma. A is the power-law normalization in units of 10⁻⁵ photons cm⁻² s⁻¹ keV⁻¹. The ‘Prob’ column gives the null hypothesis probability corresponding to χ²/ν. Confidence limits are given at 95 per cent for one interesting parameter (Δχ²= 4); confidence limits that are truncated by the allowed fit range of the parameter, rather than by Δχ²= 4 are labelled with ‘*’.