\begin{table}%t1
\caption{Date and number of CCD observations and observed hours per night. 
The two last columns are the mean distance (in arcseconds) of the satellites from Mars.}\label{tab1}
\par
%\centering
\small
\begin{tabular}{cccc}
\hline\hline
Nights     & Number of        &  Number of      & Distance from Mars \\
           & CCD observations &  observed hours & Phobos~~~~Deimos \\
           \hline
09/06/1995 &        24        &  $1^{\rm h}~52^{\rm m}$ & ~~~~~~~~~~~~~~~~21$\farcs$0  \\
12/06/1995 &        10        &  $1^{\rm h}~44^{\rm m}$ & ~~~~~~~~~~~~~~~~18$\farcs$8  \\
21/08/2003 &        64        &  $1^{\rm h}~33^{\rm m}$ & 31$\farcs$7 ~~~~~~~74$\farcs$7 \\
23/08/2003 &        87        &  $2^{\rm h}~13^{\rm m}$ & 29$\farcs$6 ~~~~~~~76$\farcs$7 \\
\hline
Total      &       185        &  $7^{\rm h}~22^{\rm m}$ & 30$\farcs$5 ~~~~~~~65$\farcs$8  \\
\hline
\end{tabular}
\end{table}