\begin{table}%t3
%\centering
\par
\caption{\label{zusammenfassung}$P$ and $\dot{f}$ derived from different methods in this paper, compared to previous results.}
\begin{tabular}{lllccc}
\hline \hline\noalign{\smallskip}
Solution & Period-8.391115 & $\dot{f}$ & rms & d.o.f. &  $\chi^2$/d.o.f.\\
&$\times$$10^{-7}$~[s]&$\times$$10^{-16}$~[Hz/s] & [s] & & \\
\hline
\multicolumn{6}{c}{This work, hard band} \\
``all data'' & 3.336(22)& --9.961(67) & 0.62 & 70--3 & 45 \\
\multicolumn{3}{l}{After fitting a sine} & 0.29 & 70--5 & 7.8\\
\multicolumn{3}{l}{After fitting an abs(sine)} &  0.31 & 70--5 & 8.6\\
without ROSAT & 3.362(39)& --9.946(74) & 0.60 & 64--3 & 47 \\
\multicolumn{3}{l}{After fitting a sine} & 0.19 & 64--5 & 5.3\\
\multicolumn{3}{l}{After fitting an abs(sine)} & 0.21 & 64--5 & 6.5\\
without Chandra & 3.310(22)& --9.940(71) & 0.61 & 58--3 & 47 \\
\multicolumn{3}{l}{After fitting a sine} & 0.31 & 58--5 & 9.7\\
\multicolumn{3}{l}{After fitting an abs(sine)} & 0.33 & 58--5 & 8.7\\
$Z_{1}^{2}$ ``all data'' &   3.09(14) &  --9.992(61) & 0.73 & 70--3 & 64\\
$Z_{1}^{2}$ without ROSAT &  2.96(13) &  --10.047(34) & 0.58 & 64--3 & 46\\
$Z_{1}^{2}$ without Chandra &  3.09(13) & --9.980(36) & 0.72 & 58--3 & 51\\
\hline
\multicolumn{6}{c}{This work, soft band} \\
``all data'' &  3.429(22)  &  --9.956(72) & 0.50 & 70--3 & 40 \\
 $Z_{1}^{2}$ ``all data''  & 3.31(62) & --9.959(17) & 0.50 & 70--3 & 39 \\
\noalign{\smallskip}\hline
\multicolumn{6}{c}{Previous work (applied to the hard band)} \\
vK07 (``all data'')& 2.670(84) & --9.88(13) & 0.97 & 70--3 & 81 \\
vK07 (without ROSAT)& 2.846(77) & --9.74(04) & 1.30 & 64--3 & 207 \\
KvK05 (``all data'')& 3.20(13) & --9.918(15) & 0.64 & 70--3 & 56 \\
KvK05 (Chandra)& 3.05(16) & --9.97(06) & 0.64 & 12--3 & 57 \\
\hline
\end{tabular}
\tablefoot{For the timing solution in this work we always excluded the Chandra HRC observation~7251. Since the phase residuals seem to follow a periodic pattern we fitted a sine and an abs(sine), see Sect.~6. All errors correspond to 1$\sigma$ confidence (for the $Z_{1}^{2}$ solution see \citealt{2002AJ....124.1788R} with errors scaled to $\sqrt{\chi^{2}/{\rm d.o.f.}}$, for the phase coherent solutions, see Sect.~5).}
\vspace*{2.5mm}
\end{table}