\begin{table}%t3
\caption {\label{logbook2}Logbook of the spectroscopic observations of HD~180~642 obtained between June 2005 and July 2007 (HJD 2~453~536.4--2~454~302.8; $\Delta T = 967.5$~days).}
%\centerline
 {\begin{tabular}{cccccccccc}
\hline\hline
 Instrument & $N$ & HJD begin & HJD end &$\Delta$T & $\langle S/N \rangle$ & $S/N$-range & 
 $T_{\rm exp}$ & Resolution & Wavelength range\\ 
\hline
FEROS & 224 & 2~453~881 & 2~454~302  & $967.5$ & 186 & $[100,300]$ & $[300,1200]$ & 48~000 & $[3570,9215]$\\
Sophie & 24 & 2~454~265 & 2~454~275 & $10.1$ & 106 & $[80,140]$ & $[1400,1500]$ & 40~000 & $[3873,6945]$\\
Aur\'elie & 14 & 2~453~536 & 2~453~544 & $8.1$ & 93 & $[80,105]$ & 900 & 25~000 & $[4530,4673]$\\
\hline
\end{tabular}}
\par
\smallskip
 {For each instrument the number of high-quality spectra $N$ (i.e., spectra with a $S/N$-ratio~$>$~80 calculated in the region near 4550~$\AA$), the HJD, the time-span (in days), the average $S/N$-ratio, the range of $S/N$-ratios, the typical exposure times (in seconds), the resolution of the spectrograph and the wavelength range 
 (in~$\AA$) are given.} 
\end{table}