All Figures

$\begin{figure} \par\includegraphics[angle=-90,width=13.5cm,clip]{0524_fig1.ps}\end{figure}$ Figure 1: Simultaneous fit of EPIC-pn (crosses) and combined EPIC-MOS (triangles) data from 14 Feb. 2001 folded through the detector response with fit residuals. The model fit was a Galactic-absorbed power-law with neutral low-abundance absorption at redshift z=0.351. The elemental abundance and absorbing column were fit simultaneously in both datasets (from 14 Feb. 2001 and 4 Feb. 2002), whereas the power-law slopes and normalisations were allowed to vary independently to account for the temporal variability of the synchrotron spectrum. Inset. Power-law model fit to the 1-10 keV EPIC-pn data of 14 Feb. 2001 with Galactic absorption only.
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In the text

$\begin{figure} \par\includegraphics[angle=0,width=8.8cm,clip]{0524_fig2.eps} \end{figure}$ Figure 2: Optical spectrum from the MMTO. Absorption lines of Fe II and Mg II at z=0.351 are labelled. Inset. A blow-up centred on the resolved Mg II doublet. Wavelength (Å) is plotted on the axis of abscissas, flux (arbitrary units) on the ordinate. (The deviations from a power-law shape at the blue and red ends of the spectrum are due to calibration and atmospheric effects and affect only the continuum shape.)
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.8cm,clip]{0524_fig3.eps} \end{figure}$ Figure 3: Comparison of MOS-pn differences in the fit parameters, redshift and gas absorbing column density. Confidence contours are 1 $\sigma$ (solid line), 2 $\sigma$ (dashes) and 3 $\sigma$ (dots) for fits to the EPIC-pn (black) and combined EPIC-MOS (grey) spectra from both observations. These parameters are clearly not significantly affected by MOS-pn calibration differences. Inset. Confidence contours for the simultaneous fit of data from all EPIC cameras.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0524_fig4.eps} \end{figure}$ Figure 4: Confidence contours (1, 2 and 3 $\sigma$ ) for the best-fit metal abundances (relative to the Solar values) and gas absorbing column density to the EPIC spectra. EPIC-pn data are plotted in black, MOS in grey. The contours overlap only at greater than the 2 $\sigma$ level. However, for both datasets the metal abundance is certainly less than half the solar value. Inset. Confidence contours for the simultaneous fit of data from all EPIC cameras.
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In the text