Table 4: Estimates of the ionisation parameter of the warm emitter using the ratio of the fluxes of O VIII Ly$\alpha $ and O VII He$\alpha $ emission lines. The fluxes were fitted assuming an O VIII absorbing column of 10 $^{\rm 17.3}$ cm$^{\rm -2}$ and an O VII column of 10 $^{\rm 16.5}$ cm$^{\rm -2}$, both blueshifted by -900 km s$^{\rm -1}$. The O VIII Ly$\alpha $ and O VII He$\alpha $ emission lines were assumed to have a blueshift of -400 km s$^{\rm -1}$ and zero intrinsic width, for fitting purposes.
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$^{\rm {a}}$ A: warm absorption applied to both continuum and emission lines, B: warm absorption only applied to continuum.
$^{\rm {b}}$ Model line flux in 10$^{\rm -5}$ photons cm$^{\rm -2}$ s$^{\rm -1}$, including the effects of Galactic (but not intrinsic) absorption.
$^{\rm {c}}$ Ratio of fluxes of O VIII Ly$\alpha $ and O VII (r) .
$^{\rm {d}}$ Implied log $\xi $ in erg cm s$^{\rm -1}$.

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