\begin{table}%t2
\caption{\label{fits} Results for power law fits  to the data of
orbit~171-1 in limited energy bands, assuming
galactic absorption ($N_{\rm H} = 1.66\times10^{20}$~cm$^{-2}$). }
%\centerline
{
\begin{tabular}{cccc}
\hline\hline \noalign{\smallskip}
\multicolumn{1}{c}{Energy band} & \multicolumn{1}{c}{$\Gamma $} &
\multicolumn{1}{c}{Norm} & \multicolumn{1}{c}{$\chi^2_{\rm red}$/d.o.f.} \\
\multicolumn{1}{c}{(keV)} &\multicolumn{1}{c}{ } &
\multicolumn{1}{c}{ (1) } & \multicolumn{1}{c}{}\\
\noalign{\smallskip} \hline \noalign{\smallskip}
$0.6{-}1.2 $ &
                 $2.25 \pm 0.01$&$ 5.99 \pm 0.01 $& 0.997/120\\
$1.2{-}1.8 $ &
                 $2.32 \pm 0.02$&$ 6.03 \pm 0.04 $& 1.21/121\\
$1.8{-}2.3 $ &
                 $2.40 \pm 0.05$&$ 6.38 \pm 0.23 $& 1.32/ 97\\
$2.5{-}3.5 $ &
                 $2.21 \pm 0.04$&$ 5.60 \pm 0.26 $& 0.98/199\\
$3.5{-}4.5 $ &
                 $2.39 \pm 0.07$&$ 7.19 \pm 0.69 $& 1.03/218\\
$4.5{-}6.0 $ &
                 $2.47 \pm 0.08$&$ 8.15 \pm 1.03 $& 1.04/298\\
$6.0{-}8.0 $ &
                 $2.59 \pm 0.11$&$ 9.95 \pm 2.06 $& 0.99/213\\
$8.0{-}10.0 $ &
                 $2.77 \pm 0.28$&$13.86 \pm 7.52 $& 0.99/ 70\\
$10.0{-}12.0$ &
                 $2.82 \pm 0.78$&$16.35 \pm 29.01$& 1.24/ 17\\
\hline
\end{tabular}}
\smallskip 
  (1): Normalization at 1~keV in 10$^{-2}$~ph/keV/cm$^2$/s. \\
\end{table}