\begin{table}%t1
\caption{\label{obs_table}Details of \textit{RXTE} observations of Her~X-1 used for the timing analysis.} 
\par
%\centerline
{\begin{tabular}{l l l l l l l l}
\hline\hline\noalign{\smallskip}
35~d cycle No.~$^{1}$                       &  257           &  269              & 303            & 313             & 323            & 351                 &373      \\
  \hline\noalign{\smallskip}
Source of observational data            & RXTE         & RXTE           & RXTE         & RXTE          & RXTE         & RXTE/INTEGRAL & INTEGRAL \\
Date of observation                          & July 96       & Sep. 97          & Dec. 00       & Dec. 01       & Nov. 02       & July 05             & Sep. 07 \\
Start of observation [MJD]                & 50~290.027 &   50~704.912  & 51~896.319 & 52~243.060  & 52~600.061  & 53~574.715      & 54~346.088\\
No. of RXTE/INTEGRAL orbits used & 18              &  14                & 33              & 45               & 29               & 8/3                & 1       \\
Elapsed time of observation [days]   & 1.42           &  2.43             & 5.62           & 3.52            & 4.02            & 8.16                & 2.03   \\
Elapsed time of obs. [binary orbits]   & 0.83           &  1.43             & 3.30           & 2.07            & 2.36            & 4.80                & 1.20   \\
Coverage of binary orbits [\%]           & 36.6           &  10.0             & 10.0           & 30.7            & 18.9            & 37.0                & 53.0   \\
Number pulse profiles                       & 139            &  45                & 61              & 161             & 133             & 9/69              & 27      \\
Mean integration time per profile [s]  & 322            & 276              & 802             & 580             & 493             & 420/2350      & 3500  \\    
\hline
\end{tabular}} 
\smallskip
\par
$^{1}$ The numbering of 35~d cycles follows \citet{Staubert_etal83}:  
``Pulse profile counting'' is applied, based on pulse profile shapes repeating with an average period of 34.98~d \citep{Staubert_etal09}.
\end{table}