All Figures

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{0884fi1a}\includegraphics[width=7.5cm,clip]{0884fi1b} \end{figure}$ Figure 1: The Chandra dataset ( left) at t=2594 days since explosion and the XMM dataset ( right) at t=2943 days since explosion.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig2} \end{figure}$ Figure 2: The lines represent the border between the radiative and adiabatic regimes for each composition. In each case the region above the line corresponds to the reverse shock being radiative, while values of $\eta$ and $V_{{\rm s}}$ below the line lead to adiabatic shocks.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig3} \end{figure}$ Figure 3: Fit to the XMM spectrum of SN 1993J for an adiabatic shock with $kT_{{\rm rev}}=1.3$ keV (dotted curve) and two radiative shock with $kT_{{\rm rev}}=0.7$ keV (upper dashed curve) and $kT_{{\rm rev}}=0.1$ keV (lower dashed curve) for a solar composition. The solid curve is the sum of the three components. Note the poor fit at the N VII peak at $\sim$ 0.5 keV and the O VII-VIII emission at $\sim$ 0.7 keV.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig4} \end{figure}$ Figure 4: Fit to the spectrum of SN 1993J with an adiabatic shock at $kT_{{\rm rev}}=1.4$ keV (long dashed) and a radiative shock at $kT_{{\rm rev}}=0.71$ keV (short dashed) for a composition based on the outer, hydrogen-rich envelope of the s15s7b2f model. Also here the fit to the N VII and O VII-VIII emission at 0.5-0.7 keV is poor.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig5} \end{figure}$ Figure 5: Fit to the XMM spectrum of SN 1993J with a composition resembling that of the circumstellar ring of SN 1987A, but with enhanced metal abundances. The fit consists of an adiabatic shock at $kT_{{\rm rev}}=1.4$ keV (dotted) and a radiative shock at $kT_{{\rm rev}}$ = 0.7 keV (dashed). The fit to the N VII peak at $\sim$ 0.5 keV has improved somewhat compared to Figs. 3 and 4, but the O VII-VIII emission at 0.7 keV is still poorly fit.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig6} \end{figure}$ Figure 6: Fit to the XMM spectrum of SN 1993J with an adiabatic shock at $kT_{{\rm rev}}=2.1$ keV (long dashed) and a radiative shock at $kT_{{\rm rev}}=1.0$ keV (short dashed), for a He/N-dominated composition from the s15s7b2f model. Note the strong improvement in the fit to the N VII peak at 0.5 keV compared to Figs. 3-5.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig7} \end{figure}$ Figure 7: Fit to the XMM spectrum of SN 1993J with two radiative shocks with $kT_{{\rm rev}}=4.5$ keV (lower dashed curve) and $kT_{{\rm rev}}=9.8$ (upper dashed curve), for a C/O-dominated composition from the 4H47 model. Note the poor fit at 0.7-1.2 keV, ruling out this model.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{0884fi1a}\includegraphics[width=7.5cm,clip]{0884fi1b} \end{figure}$	Figure 1: The Chandra dataset ( left) at t=2594 days since explosion and the XMM dataset ( right) at t=2943 days since explosion.
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$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig2} \end{figure}$	Figure 2: The lines represent the border between the radiative and adiabatic regimes for each composition. In each case the region above the line corresponds to the reverse shock being radiative, while values of $\eta$ and $V_{{\rm s}}$ below the line lead to adiabatic shocks.
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$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig4} \end{figure}$	Figure 4: Fit to the spectrum of SN 1993J with an adiabatic shock at $kT_{{\rm rev}}=1.4$ keV (long dashed) and a radiative shock at $kT_{{\rm rev}}=0.71$ keV (short dashed) for a composition based on the outer, hydrogen-rich envelope of the s15s7b2f model. Also here the fit to the N VII and O VII-VIII emission at 0.5-0.7 keV is poor.
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$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig6} \end{figure}$	Figure 6: Fit to the XMM spectrum of SN 1993J with an adiabatic shock at $kT_{{\rm rev}}=2.1$ keV (long dashed) and a radiative shock at $kT_{{\rm rev}}=1.0$ keV (short dashed), for a He/N-dominated composition from the s15s7b2f model. Note the strong improvement in the fit to the N VII peak at 0.5 keV compared to Figs. 3-5.
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$\begin{figure} \par\includegraphics[width=12cm,clip]{0884fig7} \end{figure}$	Figure 7: Fit to the XMM spectrum of SN 1993J with two radiative shocks with $kT_{{\rm rev}}=4.5$ keV (lower dashed curve) and $kT_{{\rm rev}}=9.8$ (upper dashed curve), for a C/O-dominated composition from the 4H47 model. Note the poor fit at 0.7-1.2 keV, ruling out this model.
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