All Figures

$\begin{figure} \par\includegraphics[width=8cm,clip]{1367fig1.eps}\end{figure}$ Figure 1: A RHESSI photon spectrum for 9 November 2002 at 13:14:16 UT, integrated over one rotation period of approximately 4 s. Overlaid on it, an isothermal thick-target bremsstrahlung emission (dotted line) with temperature $T=16.7\;{\rm MK}$ and emission measure $\mathcal{M}=7.54\times10^{48}\;{\rm cm}^{-3}$ , a power-law (dashed line) with spectral index $\gamma =3.39$ and normalization $F_{\!{50}}=0.525$ , and a low-energy turnover ${E_{\rm turn}}=13.4\;{\rm keV}$ . The continuous line represents the sum of these two components.
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In the text

$\begin{figure} \par\includegraphics[width=12.5cm,clip]{1367fig2.eps}\end{figure}$ Figure 2: Top: spectral index (thin line) and flux (thick line) obtained from the uncalibrated total count rates flux in the energy bands 26-35 keV and 35-44 keV and their ratio. Bottom: spectral index $\gamma$ (thin line) and non-thermal flux $F_{\!{35}}$ at 35 keV in photons ${\rm s}^{-1}~{\rm cm}^{-2}~{\rm keV}^{-1}$ (thick line) for the event of 9 November 2002, obtained by spectral fitting.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{1367fig3.eps}\end{figure}$ Figure 3: Plot of $\gamma$ versus the fitted non-thermal flux at 35 keV (given in photons ${\rm s}^{-1}$ ${\rm cm}^{-2}$ ${\rm keV}^{-1}$ ). All the 911 data points from the 24 events are shown.
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In the text

$\begin{figure} \par\includegraphics[width=16.7cm,clip]{1367fig4.eps}\end{figure}$ Figure 4: Time evolution of the photon spectral index $\gamma$ (thin line) and the non-thermal flux at 35 keV $F_{\!{35}}$ (thick line) for 4 flares.
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In the text

$\begin{figure} \par\includegraphics[width=16.7cm,clip]{1367fig5.eps}\end{figure}$ Figure 5: Spectral index $\gamma$ versus flux at 35 keV $F_{\!{35}}$ for 3 flares. The plus signs in the top and bottom row of plots mark the points forming the longest uninterrupted rise and decay phase in the flare. The regression line of the selected data points is shown.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{1367fig6.eps}\end{figure}$ Figure 6: Distribution of the linear regression slopes for the rise and decay phases. The average value is marked by the dashed line.
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{1367fig7.eps}\end{figure}$ Figure 7: The lines shown here models the relation between the spectral index $\gamma$ and the non-thermal flux $F_{\!{{E_0}}}$ at different energies E₀, assuming that $\gamma = A F_{\!{35}}^{-\alpha}$ holds at E₀=35 keV with $\alpha =0.2$ and A=3.8. The dashed line correspond to E₀=35 keV, the lower thick line to E₀=45 keV, the upper thick lines to, respectively, E₀=25 keV and E₀=9 keV. The separation between thin lines is 2 keV.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{1367fig3.eps}\end{figure}$	Figure 3: Plot of $\gamma$ versus the fitted non-thermal flux at 35 keV (given in photons ${\rm s}^{-1}$ ${\rm cm}^{-2}$ ${\rm keV}^{-1}$ ). All the 911 data points from the 24 events are shown.
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$\begin{figure} \par\includegraphics[width=16.7cm,clip]{1367fig4.eps}\end{figure}$	Figure 4: Time evolution of the photon spectral index $\gamma$ (thin line) and the non-thermal flux at 35 keV $F_{\!{35}}$ (thick line) for 4 flares.
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$\begin{figure} \par\includegraphics[width=16.7cm,clip]{1367fig5.eps}\end{figure}$	Figure 5: Spectral index $\gamma$ versus flux at 35 keV $F_{\!{35}}$ for 3 flares. The plus signs in the top and bottom row of plots mark the points forming the longest uninterrupted rise and decay phase in the flare. The regression line of the selected data points is shown.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{1367fig6.eps}\end{figure}$	Figure 6: Distribution of the linear regression slopes for the rise and decay phases. The average value is marked by the dashed line.
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