All Figures

$\begin{figure} \par\resizebox{8cm}{!}{\includegraphics{9310fig1.eps}} \end{figure}$ Figure 1: Left axis, dotted line: $\sim$ 3-30 $~{\rm keV}\xspace$ PCA mean count rate for each available observation during the August/September 2005 outburst. Each diamond indicates one RXTE observation. The mean was obtained averaging each individual light curve. The errors shown are the sigma of the distribution for each observation. Right axis, solid line: pulse period evolution during the outburst. The vertical line indicates the time of periastron.
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In the text

$\begin{figure} \par\resizebox{7.5cm}{!}{\includegraphics{9310fig2.eps}} \end{figure}$ Figure 2: PCA and HEXTE background substracted pulse profiles from one observation during the pre-periastron flare a), with $L_{(5-50{\rm keV}\xspace)}\sim0.45\times10^{37}~{\rm erg~s^{-1}}\xspace$ , and from one observation near the maximum of the outburst b), with $L_{(5-50~{\rm keV}\xspace)}\sim0.75\times10^{37}~{\rm erg~s^{-1}}\xspace$ . Two pulse cycles are shown for clarity. In the upper panel the PCA light curve is shown. The vertical lines indicate the corresponding observations. The exposure times are $2.2~{\rm ks}\xspace$ in a) and $12.35~{\rm ks}\xspace$ in b).
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In the text

$\begin{figure} \par\resizebox{7.5cm}{!}{\includegraphics{9310fig3.eps}} \end{figure}$ Figure 3: $E_{{\rm fold}}$ vs. $E_{{\rm cyc}}$ ( left) and $\sigma$ vs. $E_{{\rm cyc}}$ ( right) contour plots for one observation near the maximum (dotted lines, observation (b) in Fig. 2) and for the sum of the three available observations during the pre-outburst flare (solid lines). The contours indicate $\chi ^{2}_{{\rm min}}+2.30(68\%), 4.61(90\%), 9.21(99\%)$ levels.
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In the text

$\begin{figure} \par\resizebox{7cm}{!}{\includegraphics{9310fig4.eps}} \end{figure}$ Figure 4: First panel: PCA light curve. Second panel: fundamental CRSF energy during the ourbusrt. Inset shows a zoom on the pre-outburst flare. Third and forth panels: photon index and folding energy evolution. Errors are $90\%$ confidence for one parameter of interest ( $\chi^{2}_{\min}$ +2.7).
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In the text

$\begin{figure} \par\resizebox{7.5cm}{!}{\includegraphics{9310fig3.eps}} \end{figure}$	Figure 3: $E_{{\rm fold}}$ vs. $E_{{\rm cyc}}$ ( left) and $\sigma$ vs. $E_{{\rm cyc}}$ ( right) contour plots for one observation near the maximum (dotted lines, observation (b) in Fig. 2) and for the sum of the three available observations during the pre-outburst flare (solid lines). The contours indicate $\chi ^{2}_{{\rm min}}+2.30(68\%), 4.61(90\%), 9.21(99\%)$ levels.
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$\begin{figure} \par\resizebox{7cm}{!}{\includegraphics{9310fig4.eps}} \end{figure}$	Figure 4: First panel: PCA light curve. Second panel: fundamental CRSF energy during the ourbusrt. Inset shows a zoom on the pre-outburst flare. Third and forth panels: photon index and folding energy evolution. Errors are $90\%$ confidence for one parameter of interest ( $\chi^{2}_{\min}$ +2.7).
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