\begin{table}%t3
\caption{\label{tab:best_fit}Best-fit estimates of the parameters of the mutual events successfully observed in this work.} 
 %\centerline
 {
 \begin{tabular}{cccccccc}
 \hline\hline
 Date  & Event &  Obs. &    Midtime                 & Impact parameter     & Albedo                            &  Relative speed on   & Mean rms \\
 (DDMMYY) &  type &  site &      (UT)                  &        (km)          & ratio                             &  impact plane (km~s$^{-1}$)  & of fit \\
 \hline                                                                                               040507 & 4O2P &  FTS  & 19:09:53 $\pm$ 3   & 400 $\pm$ 70       &  $1.229 ^a \pm 0.1$      &  $7.078^a$ & 0.031 \\ 
 050807 & 4O2P &  FTN  & 13:53:49 $\pm$ 30    & 850 $\pm$ 30        &  $1.238^a \pm 0.1$      &  $1.225^a$ & 0.019 \\
 140807 & 2O4P &  ATH1 & 01:34:25 $\pm$ 28    & 750 $\pm$ 160      &  $0.813^a \pm 0.1$      &  $5.765^a$ & 0.083 \\ 
 220807 & 2E5T &  FTN  & 15:03:37 $\pm$ 5     & 0 $\pm$ 60           &  $0.410 \pm 0.025$  (0.617)       &  $3.647^a$ & 0.039 \\ 
 240807 & 1O2P &  FTN  & 12:24:04 $\pm$ 30    & 840 $\pm$ 30       &  $1.833^a \pm 0.1$      &  $2.210^a$ & 0.018 \\[0.5mm]    
 121007 & 4E5T &  FTN  & 09:51:53 $\pm$ 2   & $\rm 410^{+150}_{-410}$  &  $\rm 1.271^{+0.55}_{-0.28}$ (0.759)  &  $5.179^a$ & 0.042 \\[1mm]
 301107 & 1E5T &  FTN  & 08:53:58 $\pm$ 2   & $\rm 310^{+90}_{-130}$ &  $\rm 0.830^{+0.22}_{-0.14}$ (1.216)    &  $7.403^a$ & 0.040 \\[0.5mm]
 301107 & 3E4P &  SALT & 18:47:36 $\pm$ 5   & 260 $\pm$ 150    &  $1.113^a \pm 0.1$      &  $1.992^a$ & 0.032 \\
  \hline
 \end{tabular}}
\par
$^a$ These parameters have been assumed and kept fixed during the fitting process. 
\par
\end{table}