\begin{table}%t2
\caption{Inter-calibration constants for the X-ray light curves.}\label{table:renorm} 
%\centerline
  {\small \begin{tabular}{c c c c c c c c}       
\hline\hline                
Energy [keV] & \rxte\ & \sax/LECS & \sax/MECS & \sax/PDS & \xmm/PN & \integral\ & \swift/XRT \\   
\hline                      
   0.5 & --               & $1.67 \pm 0.07$ & --              & -- & 1  & -- &  4.87$^a$ \\
   1   & --               & $1.35 \pm 0.02$ & --              & --  & 1  & --  &  4.87$^a$ \\
   2   & --               & --               & 0.87 $\pm$ 0.02 & --  & 1  & --  &  4.87$^a$ \\
   5   & 0.77 $\pm$ 0.12 & --               & 1               &  -- & 1  & 1 &  4.87$^b$ $\pm$ 1.27 \\
   10  & 0.78 $\pm$ 0.15 & --               & 1               &  -- & 1  & 1 &  -- \\
   20  & 0.78$^c$  & --  & --  & 1  & --  & 1 &  -- \\
   50  & 0.78$^c$        & --               & --               & 1  & --  & 1 &  -- \\
   100 & 0.78$^c$        & --               & --               & 1  & --  & 1  &  -- \\
   200 & --               & --               & --               & 1  & --  & 1  &  -- \\
\hline                         
Renormalised to & \xmm/PN & \xmm/PN & \xmm/PN & \rxte & -- & \rxte & \rxte \\   
\hline                         
\end{tabular}}
\medskip
$^a$ Fixed to the value found at 5~keV. $^b$ This large scaling factor is due to the pile-up affecting the XRT images of \thc\ and it does not have to be considered as an inter-calibration constant between \swift/XRT and \rxte. $^c$ Fixed to the value found at 10~keV.
\end{table}