All Figures

$\begin{figure} \par\includegraphics[angle=-90,width=8.8cm,clip]{H0138F1.ps}\end{figure}$ Figure 1: The SED used (solid line) in the present analysis and the analysis of the HST STIS data by Crenshaw et al. (2003). For comparison, the SED used by Kaastra et al. (2002a) and Steenbrugge et al. (2003) in earlier papers on NGC 5548 is plotted as the dot-dash line. The SED adopted by Dumont et al. (1998) is plotted as the dotted line.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.75cm,clip]{H0138F2.ps}\end{figure}$ Figure 2: The MEG (open circles) and LETGS (filled squares) line profiles for the deepest line of O VIII, O VII, O V and C VI. The five outflow velocities measured in the UV are indicated by the dotted line. No correction was made for possible blending.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.7cm,clip]{H0138F3.ps}\end{figure}$ Figure 3: The measured outflow velocity versus the logarithm of the ionization parameter. The dotted line indicates the -530 km s^-1 outflow velocity, the dominant component in the UV absorber. A trend toward higher outflow velocities for higher ionized ionization parameters is observed.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.75cm,clip]{H0138F4.ps}\end{figure}$ Figure 4: Comparison between the ionic column densities calculated with the warm model (x-axis is model D) and the ionic column densities obtained with the slab model (y-axis is model B). The solid line represents the solution where the predicted warm and measured slab column densities are equal.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.75cm,clip]{H0138F5.ps}\end{figure}$ Figure 5: Detail of the LETGS spectrum showing the fit with (thick line) and without (thin line) a broad emission line for the O VII resonance line. The profile of the broadened emission line is also plotted.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.8cm,clip]{H0138F6.ps}\end{figure}$ Figure 6: The transmission for the best fit model with three xabs components for the LETGS (thin solid line) and the HETG (dotted line) spectra. Note that the difference is largest, 10% in continuum transmission and 35% for the largest difference in absorption lines, for lowly ionized ions which have absorption lines around 20 Å. Here the MEG effective area is already rather low, and the errors on this lowest ionization parameter are large.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.75cm,clip]{H0138F7.ps}\end{figure}$ Figure 7: Fit residuals of the 1999 LETGS spectrum minus the fit residuals of the 2002 spectrum, normalized as described in the text. For clarity, the residuals have been rebinned by a factor of 8. The dashed lines indicate the 2.5 $\sigma$ significance level used in the analysis.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.75cm,clip]{H0138F8.ps}\end{figure}$ Figure 8: The ionic column density versus the logarithm of the ionization parameter for the three outflow velocity components as measured for six ions in X-rays, 2 ions (C IV and N V) measured simultaneously with HST STIS (Crenshaw et al. 2003) and the lower limits for O VI from non-simultaneous FUSE data (Brotherton et al. 2002, taking their preferred uncovered model; Arav et al. 2003). In calculating the column densities for the UV data we kept the highest outflow value separate, added the two middle ones and the two lower ones (see Sect. 5.2). For O VII the ionization parameter was decreased by 0.05 for easier identification. The open circle indicates the total column density for O VI obtained from the LETGS and MEG spectra.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.3cm,clip]{H0138F9.ps}\end{figure}$ Figure 9: The column densities for iron as measured by the RGS instrument, with the fit for a model with four (dash-dot line) and five (thick solid line) ionization components. The fit with four ionization components clearly underpredict the Fe XXIV column density.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.3cm,clip]{H0138F10.ps}\end{figure}$ Figure 10: The temperature versus ionization parameter for constant pressure $\Xi$ diagram for the SED used in the present analysis (thick line) and for the SED used in earlier LETGS (Kaastra et al. 2002a) and RGS (Steenbrugge et al. 2003) analysis (thin line). The $\xi$ values corresponding to the currently used SED are indicated on the x-axis on top. The five components derived from fitting iron in the RGS spectrum are indicated. The dotted lines indicate the boundaries of the marginally stable branch for the SED used in analyzing the RGS data; the dash-dotted lines are the same boundaries, but for the current used SED.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.3cm,clip]{H0138F11.ps}\end{figure}$ Figure 11: The total hydrogen column density $N_{\rm H}$ , assuming solar abundances (Anders & Grevesse 1989) derived using Eq. (3), plotted versus ionization parameter. The ionic column densities were taken from Tables 4 and A.1 assuming a velocity broadening of 140 km s^-1. For clarity, no upper limits have been plotted. The best fit results for model D are plotted as the two crosses connected by a dotted line.
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In the text

$\begin{figure} \par\includegraphics[width=6.5cm,height=8cm,angle=-90]{H0138F12.p... ...4cm} \includegraphics[width=6.5cm,height=8cm,angle=-90]{H0138F17.ps}\end{figure}$ Figure C.1: Detail of the HEG, MEG and LETGS spectra. The dotted lines indicate the zero flux level for the HEG and MEG spectra.

In the text

$\begin{figure}\par\includegraphics[width=6.5cm,height=8cm,angle=-90]{H0138F18.ps... ...4cm} \includegraphics[width=6.5cm,height=8cm,angle=-90]{H0138F23.ps}\end{figure}$ Figure C.1: continued.

In the text

$\begin{figure}\par\includegraphics[width=6.5cm,height=8cm,angle=-90]{H0138F24.ps... ...4cm} \includegraphics[width=6.5cm,height=8cm,angle=-90]{H0138F29.ps}\end{figure}$ Figure C.1: continued.

In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.8cm,clip]{H0138F1.ps}\end{figure}$	Figure 1: The SED used (solid line) in the present analysis and the analysis of the HST STIS data by Crenshaw et al. (2003). For comparison, the SED used by Kaastra et al. (2002a) and Steenbrugge et al. (2003) in earlier papers on NGC 5548 is plotted as the dot-dash line. The SED adopted by Dumont et al. (1998) is plotted as the dotted line.
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$\begin{figure} \par\includegraphics[angle=-90,width=8.75cm,clip]{H0138F2.ps}\end{figure}$	Figure 2: The MEG (open circles) and LETGS (filled squares) line profiles for the deepest line of O VIII, O VII, O V and C VI. The five outflow velocities measured in the UV are indicated by the dotted line. No correction was made for possible blending.
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$\begin{figure} \par\includegraphics[angle=-90,width=8.7cm,clip]{H0138F3.ps}\end{figure}$	Figure 3: The measured outflow velocity versus the logarithm of the ionization parameter. The dotted line indicates the -530 km s^-1 outflow velocity, the dominant component in the UV absorber. A trend toward higher outflow velocities for higher ionized ionization parameters is observed.
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$\begin{figure} \par\includegraphics[angle=-90,width=8.75cm,clip]{H0138F4.ps}\end{figure}$	Figure 4: Comparison between the ionic column densities calculated with the warm model (x-axis is model D) and the ionic column densities obtained with the slab model (y-axis is model B). The solid line represents the solution where the predicted warm and measured slab column densities are equal.
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$\begin{figure} \par\includegraphics[angle=-90,width=8.75cm,clip]{H0138F5.ps}\end{figure}$	Figure 5: Detail of the LETGS spectrum showing the fit with (thick line) and without (thin line) a broad emission line for the O VII resonance line. The profile of the broadened emission line is also plotted.
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$\begin{figure} \par\includegraphics[angle=-90,width=8.75cm,clip]{H0138F7.ps}\end{figure}$	Figure 7: Fit residuals of the 1999 LETGS spectrum minus the fit residuals of the 2002 spectrum, normalized as described in the text. For clarity, the residuals have been rebinned by a factor of 8. The dashed lines indicate the 2.5 $\sigma$ significance level used in the analysis.
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$\begin{figure} \par\includegraphics[angle=-90,width=8.3cm,clip]{H0138F9.ps}\end{figure}$	Figure 9: The column densities for iron as measured by the RGS instrument, with the fit for a model with four (dash-dot line) and five (thick solid line) ionization components. The fit with four ionization components clearly underpredict the Fe XXIV column density.
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