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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0198fig1.eps}\end{figure}$ Figure 1: High-energy total photoabsorption cross sections of the ground level of: a) Fe XVII including radiative and Auger damping effects; b) Fe XVII excluding damping effects for resonances with n>2; c) Fe XXIII including damping; d) Fe XXIII excluding damping for resonances with n>2. It may be appreciated that when damping is included the resonance widths are constant for high n leading to a smearing of the K edge.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{0198fig2.eps}\end{figure}$ Figure 2: High-energy total photoabsorption cross section of the ground levels of Fe XVII, Fe XVIII, Fe XIX and Fe XX.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{0198fig3.eps}\end{figure}$ Figure 3: High-energy total photoabsorption cross section of the ground levels of Fe XXI, Fe XXII and Fe XXIII.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=14.6cm,clip]{0198fig4.eps}\end{figure}$ Figure 4: Partial photoionization cross sections from the $[{\rm 2p}]^3~^4{\rm S}^{\rm o}_{3/2}$ ground level of Fe XX to the first twelve K-vacancy levels of Fe XXI.
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In the text

$\begin{figure} \includegraphics[angle=270,width=14.6cm,clip]{0198fig5.eps}\end{figure}$ Figure 5: Comparison of electron impact collision strengths computed with the BPRM method for K-shell excitation of the $[{\rm 2p}]^2\ ^3{\rm P}_2$ ground level of Fe XIX to the following upper levels: a) $[{\rm 1s}][{\rm 2p}]\ ^3{\rm P}^{\rm o}_2$ excluding damping; b) $[{\rm 1s}][{\rm 2p}]\ ^3{\rm P}^{\rm o}_2$ including damping; c) $[{\rm 1s}][{\rm 2p}]\ ^3{\rm P}^{\rm o}_1$ excluding damping; d) $[{\rm 1s}][{\rm 2p}]\ ^3{\rm P}^{\rm o}_1$ including damping; e) $[{\rm 1s}][{\rm 2p}]\ ^3{\rm P}^{\rm o}_0$ excluding damping; and f) $[{\rm 1s}][{\rm 2p}]\ ^3{\rm P}^{\rm o}_0$ including damping. It may be seen that when damping is taken into account the resonance contribution is essentially washed out.
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=14.7cm,clip]{0198fig6.eps}\end{figure}$ Figure 6: A selection of collision strengths for Fe XX that shows the contributions of high partial waves at high energies. Dotted lines depict collision strengths obtained with J $\leq$ 22/2 while the solid lines those that have been fully topped up to J = $\infty$ . a) $[{\rm 2p}]^3\ ^4{\rm S}^{\rm o}_{3/2}{-}[{\rm 1s}][{\rm 2p}]^2\ ^4{\rm P}_{5/2}$ ; b) $[{\rm 2p}]^3\ ^4{\rm S}^{\rm o}_{3/2}{-}[{\rm 1s}][{\rm 2p}]^2\ ^4{\rm P}_{3/2}$ ; c) $[{\rm 2p}]^3\ ^4{\rm S}^{\rm o}_{3/2}{-}[{\rm 1s}][{\rm 2p}]^2\ ^4{\rm P}_{1/2}$ ; d) $[{\rm 2p}]^3\ ^4{\rm S}^{\rm o}_{3/2}{-}[{\rm 1s}][{\rm 2p}]^2\ ^2{\rm D}_{3/2}$ ; e) $[{\rm 2p}]^3\ ^4{\rm S}^{\rm o}_{3/2}{-}[{\rm 1s}][{\rm 2p}]^2\ ^2{\rm D}_{5/2}$ ; f) $[{\rm 2p}]^3\ ^4{\rm S}^{\rm o}_{3/2}{-}[{\rm 1s}][{\rm 2p}]^2\ ^2{\rm P}_{1/2}$ .
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In the text

$\begin{figure} \par\includegraphics[angle=270,width=15.1cm,clip]{0198fig7.eps}\end{figure}$ Figure 7: Samples of electron impact effective collision strengths plotted with the reduced scales of Burgess & Tully (1992). a) Fe XX $[{\rm 2p}]^3\ ^4{\rm S}^{\rm o}_{3/2}{-}[{\rm 1s}][{\rm 2p}]^2\ ^4{\rm P}_{5/2}$ ; b) Fe XX $[{\rm 2p}]^3\ ^4{\rm S}^{\rm o}_{3/2}{-}[{\rm 1s}][{\rm 2p}]^2\ ^4{\rm P}_{3/2}$ ; c) Fe XX $[{\rm 2p}]^3\ ^4{\rm S}^{\rm o}_{3/2}{-}[{\rm 1s}][{\rm 2p}]^2\ ^4{\rm P}_{1/2}$ ; d) Fe XXI $[{\rm 2p}]^4\ ^3{\rm P}_{0}{-}[{\rm 1s}][{\rm 2p}]^3\ ^3{\rm D}^{\rm o}_{1}$ ; e) Fe XIX $[{\rm 2p}]^2\ ^3{\rm P}_{2}{-}[{\rm 1s}][{\rm 2p}]\ ^3{\rm P}^{\rm o}_{2}$ ; and f) Fe XXIII ${\rm 2s}^2\ ^1{\rm S}_{0}{-}[{\rm 1s}]{\rm 2p}\ ^1{\rm P}^{\rm o}_{1}$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{0198fig2.eps}\end{figure}$	Figure 2: High-energy total photoabsorption cross section of the ground levels of Fe XVII, Fe XVIII, Fe XIX and Fe XX.
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{0198fig3.eps}\end{figure}$	Figure 3: High-energy total photoabsorption cross section of the ground levels of Fe XXI, Fe XXII and Fe XXIII.
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$\begin{figure} \par\includegraphics[angle=270,width=14.6cm,clip]{0198fig4.eps}\end{figure}$	Figure 4: Partial photoionization cross sections from the $[{\rm 2p}]^3~^4{\rm S}^{\rm o}_{3/2}$ ground level of Fe XX to the first twelve K-vacancy levels of Fe XXI.
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