\begin{table}%T3
\caption{Main characteristics of the selected DBs (central depth $A_{\rm C}$ and
normalised equivalent width $EW$/$E(B-V)$), as measured towards
the prototype star HD 183143 \citep{Herbig95}.} 
\label{tb:caracdbs} 
\small%\centering
\par
\begin{tabular}{c c c c c l} \hline \hline
    &       & \multicolumn{2}{c}{HD 183143}         &\multicolumn{2}{c}{This work}\\
\cline{3-4}\cline{5-6}
DB      & $\lambda_{0}$ &     $A_{\rm c}$    &   $EW$/$E(B-V)$  &   $EW$/$E(B-V)$ &   $r$         \\
(\AA)   &    (\AA)      &          &  (\AA/mag) &   (\AA/mag)   &         \\
\hline
5780    &   5780.37     &      0.32    &   0.63     &   0.46    &   0.74      \\
5797    &   5796.96     &      0.20    &   0.19     &   0.17    &   0.73      \\
5850    &   5849.80     &      0.069   &   0.06     &   0.061   &   0.75      \\
6196    &   6195.96     &      0.084   &   0.06     &   0.053   &   0.82      \\
6284    &   6283.85     &      0.32    &   1.5      &   0.90    &   0.69      \\
6379    &   6379.29     &      0.10    &   0.096    &   0.088   &   0.62      \\
6614    &   6613.56     &      0.24    &   0.29     &   0.21    &   0.80      \\
6993    &   6993.18     &      0.14    &   0.14     &   0.12    &   0.95      \\
7224    &   7224.00     &      0.21    &   0.29     &   0.25    &   0.99      \\
\hline
\end{tabular}
\smallskip
$A_{\rm c} = 1 - F(\lambda_{0}$) / $F$(continuum). \\
The reference wavelengths are taken from \citet{Galazutdinov00}
(Col.~2). The equivalent width per extinction unit (this work)
derived from published data from \citet{Jenniskens94b},
\citet{Weselak01}, \citet{Thorburn03} and \citet{Megier05} is
given for each DIB in Col.~5, with corresponding correlation
coefficients in Col.~6.
\end{table}