\begin{table}%tA.1
\caption{Comparison of the best fit parameters obtained using the standard
  matrix (ISDC) and the new A.S. version.\label{tab2} }
%\centerline
{\begin{tabular}{@{}llll}
\hline 
\hline
Parameter & OSA 4.2 & A.S. Version & Other experiment \\ 
\hline
\multicolumn{3}{l}{{{Crab nebula+pulsar}: Power Law }} \\
$\alpha$           & $2.19\pm0.03^*$     & $2.09\pm0.03$  & 2.1  \\
$K$  (ph cm$^{-2}$ s$^{-1}$ KeV$^{-1}$)    &  $10.2\pm0.2^*$     & $9.6\pm0.2$ & 9.7 \\
$\chi^2$ (d.o.f.)  &  5.6  (95)            & 1.3 (95) & \\
                   &       &          & Ref. (1) \\
\hline
\multicolumn{4}{l}{{{\object{GX 1+4}}: Comptonization continuum model (COMPTT in XSPEC)}} \\
$T_0$ (keV)  &   1.27 (frozen)   &  1.27 (frozen) &   1.27$^{+1.4}_{-1.1}$   \\
$T_{\rm e}$(keV)   & $13.5\pm0.5$      &  $12.6\pm0.4$  &   10.3$^{+13}_{-9}$  \\
$\tau$     &  $2.7\pm0.1$      &  $3.3\pm0.2$   &   3.7$^{+4}_{-3}$ \\
$K$ (ph cm$^{-2}$ s$^{-1}$ KeV$^{-1}$)& ($2.1\pm0.1)\times 10^{-2}$ & ($1.9\pm0.1)\times 10^{-2}$ & 2.1$^{+2.3}_{-1.8}\times 10^{-2}$  \\
$\chi^2$ (d.o.f.) & 1.5 (58) & 1.1 (58)  & \\
                   &       &          & Ref. (2) \\
\hline
\multicolumn{4}{l}{{{\object{ Cygnus X1}}: Cut-off power law}} \\
$\alpha$      & $1.66\pm0.04^*$     &  $1.45\pm0.04$    &  $1.45\pm0.01$  \\
$E_{\rm c}$ (keV)   & $158\pm12^*$        &  $122\pm7$        &  $162\pm9$ \\
$K$ (ph cm$^{-2}$ s$^{-1}$ KeV$^{-1}$)    & $1.7\pm0.3^*$  &  $1.2\pm0.3$   &  $0.91\pm0.04$ \\
$\chi^2$ (d.o.f.) & 3.2 (48) & 1.9  (48) \\
                   &       &          & Ref. (3) \\
\hline
\multicolumn{4}{l}{{{\object{Sco X1}}: Bremstralung + Power law}} \\
$KT$ (keV)                                    & $4.2\pm0.1$                   & $4.3\pm0.1$  & $4.51\pm0.08$   \\
Flux$_{20-50 ~\rm keV}$ (erg cm$^{-2}$ s$^{-1}$)   &($5.5\pm0.3)\times 10^{-9}$ & ($6.5\pm0.4)\times 10^{-9}$ &($7.4\pm0.6)\times 10^{-9}$ \\
$\alpha$                                      & $2.9\pm0.2$                  & 
$2.8\pm0.2$   &  $2.4\pm0.3$ \\
Flux$_{20-200~\rm  keV}$ [erg cm$^{-2}$ s$^{-1}$]  &($0.8\pm 0.4)\times 10^{-9}$ & ($0.7\pm 0.4)\times 10^{-9}$ &($1.04\pm 0.08)\times 10^{-9}$ \\
$\chi^2$ (d.o.f.)                             & 1.3 (52)                      & 1.4 (52) &\\
                   &       &          & Ref. (4) \\
\hline
\end{tabular}}
\par
\smallskip
$^*$ Errors are computed introducing systematic errors in
  order to reduce the $\chi^2$ below 2.0. \\
(1) \citet{torr74};  
(2) \citet{gall00}; 
(3) \citet{dove98}; 
(4) \citet{dami01}.
\end{table}