\begin{table}%t1
\caption[ ]{\label{observables.tab}Observational parameters of the open cluster sample.}
\par
 {\begin{tabular}{lclclrlrlllllllllllll}
\hline
\hline
Name     & \multicolumn{2}{c}{$R_{\rm c}$} & \multicolumn{2}{c}{$\pm$} & \multicolumn{2}{c}{$D$} & \multicolumn{2}{c}{$\pm$} & \multicolumn{2}{c}{$V$} & \multicolumn{2}{c}{$\pm$} & \multicolumn{2}{c}{$E(B-V)$} & \multicolumn{2}{c}{$\pm$} & \multicolumn{2}{c}{$\sigma$} & \multicolumn{2}{c}{$\pm$} \\
         & \multicolumn{1}{c}{(arcmin)} & \multicolumn{1}{c}{Ref.} & \multicolumn{1}{c}{(arcmin)} & \multicolumn{1}{c}{Ref.} & \multicolumn{1}{c}{(pc)} & \multicolumn{1}{c}{Ref.} & \multicolumn{1}{c}{(pc)} & \multicolumn{1}{c}{Ref.} & \multicolumn{1}{c}{(mag)} & \multicolumn{1}{c}{Ref.} & \multicolumn{1}{c}{(mag)} & \multicolumn{1}{c}{Ref.} & \multicolumn{1}{c}{(mag)} & \multicolumn{1}{c}{Ref.} & \multicolumn{1}{c}{(mag)} & \multicolumn{1}{c}{Ref.} & \multicolumn{1}{c}{(km s$^{-1}$)} & \multicolumn{1}{c}{Ref.} & \multicolumn{1}{c}{(km\,s$^{-1}$)} & \multicolumn{1}{c}{Ref.} \\
\hline
NGC 1976 &  7.2  & 38 & 2.4  & 13    &  470 & 13 &  70 & 9, 20, 45     & 1.26 & 21    & 0.1 & $^a$  & 0.05 & 9, 20  & 0.01 & $^a$          & 2.34 & 45 & 0.7  & 17, 45 \\
         &       &    &      &       &      & 38 &     &             &      &       &     &       &      &       &      &               &      &    &      &    \\
NGC 2168 & 12.0  & 20 & 1.2  & $^a$  &  912 &  9 &  68 & 3, 9, 19, 20   & 4.86 & 42, 43 & 0.2 & $^a$  & 0.20 & 9, 19  & 0.05 &  3, 20, 35, 39   & 1.00 & 26 & 0.10 & 26 \\
         &       &    &      &       &      & 19 &     & 26, 42, 43    &      &       &     & (3)   &      &       &      & 42, 43, 47      &      &    &      &    \\
NGC 2516 & 12.0  & 20 & 1.8  & $^a$  &  358 & 41 &  60 &  3, 6, 9      & 3.1  & $^b$  & 0.3 &  3, 35 & 0.11 & 41    & 0.02 & 7, 9, 20, 35     & 1.35 & 33 & 0.35 & 33 \\
         &       &    &      &       &      &    &     & 20, 42, 43    &      &       &     &       &      &       &      & 41, 42, 43      &      &    &      &    \\
NGC 2632 & 66.0  & 15 & 4.0  & 20    &  171 & 31 &  12 &  2, 9, 20     & 3.2  & 39    & 0.1 &  3, 35 & 0.00 & 31, 35 & 0.01 & 9, 20, 36       & 0.48 & 16 & 0.2  & 16 \\
         &       &    &      &       &      &    &     & 31          &      &       &     &       &      & 39    &      &               &      &    &      &    \\
NGC 2682 &  4.7  &  4 & 0.6  &  4    &  820 & 31 &  47 & 31, 36, 37    & 6.5  & 36    & 0.3 & 35, 39 & 0.05 & 31    & 0.02 & 9, 20, 31, 35, 36 & 0.81 & 12 & 0.4  & 12, 25 \\
         &       &    &      &       &      &    &     & 42, 43       &      &       &     & 42, 43 &      &       &      & 39, 42, 43, 44   &      &    &      &    \\
NGC 3532 & 12.0  & 20 & 1.2  & $^a$  &  492 & 31 &   8 & 3, 9, 20, 31   & 3.1  &  3    & 0.2 & $^a$  & 0.04 &  3, 20 & 0.01 & 5, 9, 31        & 1.49 & 11 & 0.29 & 11 \\
         &       &    &      &       &      &    &     &             &      &       &     &       &      & 31    &      &               &      &    &      &    \\
NGC 5662 &  6.0  & 20 & 1.2  & $^a$  &  684 & 31 &  60 & 9, 20, 31, 34  & 5.6  & 30    & 0.2 & $^a$  & 0.32 & 30, 31 & 0.01 & 9, 20, 31, 34    & 1.2  & 33 & 0.3  & 33 \\
         &       &    &      &       &      &    &     & 42, 43       &      &       &     &       &      & 42, 43 &      &               &      &    &      &    \\
NGC 6705 &  1.38 & 27 & 0.90 &  8, 20 & 2042 & 40 & 150 &  3, 8, 9, 20   & 6.8  & 27    & 0.4 &  3, 42 & 0.43 & 9, 20  & 0.03 & 3, 8, 30, 39, 40  & 2.0  & 26 & 0.8  & 24, 25 \\
         &       &    &      & 23, 27 &      &    &     & 27, 40, 42, 43 &      &       &     & 43    &      & 40    &      & 42, 43         &      &    &      &    \\
Pleiades & 66.0  &  1 & 9.0  &  1    &  133 & 31 &   9 & 9, 20, 31     & 1.2  & 35    & 0.1 & 39    & 0.05 & 31    & 0.01 & 9, 20, 31, 35, 39 & 0.6  & 26 & 0.2  & 15 \\
         &       & 20 &      &       &      &    &     &             &      &       &     &       &      &       &      &               &      &    &      &    \\
Coma Ber & 96.0  & 28 & 9.0  & 20, 28 &   86 & 31 &   7 & 9, 20, 28, 31  & 1.8  & 35    & 0.2 & $^a$  & 0.00 & 20, 31 & 0.01 & 9, 31          & 0.3  & 28 & 0.2  & $^a$ \\
         &       &    &      &       &      &    &     &             &      &       &     &       &      & 35    &      &               &      &    &      &    \\
Hyades   &205.8  & 32 & 2.0  & $^a$  &   42 & 31 &   3 & 9, 31        & 0.5  & $^b$  & 0.1 & 35, 39 & 0.00 & 31, 35 & 0.01 & 9, 31          & 0.32 & 22 & 0.2  & $^a$ \\
         &       &    &      &       &      &    &     &             &      &       &     &       &      & 36, 39 &      &               &      &    &      &     \\
\hline
\end{tabular}
} 
\par
\smallskip
{Notes.} $^a$ Adopted based on realistic measurement errors for
large samples of open clusters (Dias et~al. \cite{Dias02}; and unpublished);
$^b$ average.
\end{table}