\begin{table}%T4 
\par
\caption{\label{alphabeta}Predicted spectral slope $\beta$ in the X-ray band
for the two different cases A and B discussed in Sect.~\ref{Xcurve}.} 
\small%\centerline
{
\begin{tabular}{clcc}
\hline\hline
{\bf Model}  & {\bf $\beta(\alpha)$}   &{\bf $\beta_{\rm A}$}& {\bf $\beta_{\rm B}$} \\
\hline
Fast cooling ($\nu_{\rm c} < \nu_{\rm X}$) &&& \\ 
  ISM$_{\rm iso}$ & $(2\alpha_1+1)/3$&$0.56 \pm 0.02$&$1.59 \pm 0.05$\\
  ISM$_{\rm jet}$ & $\alpha_2/2$     &$0.94 \pm 0.04$&$1.52 \pm 0.15$\\
wind$_{\rm iso}$ & $(2\alpha_1+1)/3$     &$0.56 \pm 0.02$&$1.59 \pm 0.05$\\
wind$_{\rm jet}$ & $\alpha_2/2$          &$0.94 \pm 0.04$&$1.52 \pm 0.15$\\
Slow cooling ($\nu_{\rm c} > \nu_{\rm X}$) &&& \\
 ISM$_{\rm iso}$ & $ 2\alpha_1/3$   &$0.23 \pm 0.02 $&$1.26 \pm 0.05$\\
 ISM$_{\rm jet}$ & $(\alpha_2-1)/2$ &$0.44 \pm 0.04 $&$1.02 \pm 0.15$\\
wind$_{\rm iso}$  &(2$\alpha_1-1)/3$     &$-0.11\pm0.02$& $0.93\pm0.05$\\
wind$_{\rm jet}$  & $(\alpha_2-1)/2$     & $0.44\pm0.04$  & $1.02\pm0.15$\\
\hline
\end{tabular}}
\smallskip
 The calculated spectral slopes $\beta_{\rm A}$, and $\beta_{\rm B}$ have to be 
compared with the observed $\beta_{\rm X} = 1.06\pm0.16$ (Sect.~\ref{xray}).
For Case A it is $\alpha_1 = 0.34\pm0.03$ and $\alpha_2= 1.89\pm0.07$,
while for Case B it is $\alpha_1 = 1.89\pm0.07$ and $\alpha_2 = 3.03\pm0.30$. 
\end{table}