\begin{table}%t4
  \caption{\label{table:labels}Labels and luminosities (with errors when they were given in the
           literature) used in 
           Figs.~\ref{fig:shape-strength}--\ref{fig:strength-slope}.}
  \setlength\tabcolsep{11.3pt}
  %\centerline
{\begin{tabular}{rlcr}
    \hline
    \hline
    Label &  Target      &   $L/L_{\odot}$               &  Ref. \\
    \hline
    \noalign{\smallskip}
      1   &  HD~72~106 B  &   $\rm 9.9_{- 5.6}^{+  12.7}$    &  (1)  
      \medskip \\
      2   &  HD~98~800 B  &   $\rm 0.58_{- 0.11}^{+  0.11}$  &  (2)  
      \medskip \\
      3   &  HD~113~766 A &   $\rm 4.4_{- 0.4}^{+  0.4}$     &  (3)  
      \medskip \\
      4   &  HD~123~356 B &   ...                        &  (4)  
      \medskip \\
      5   &  HD~143~006   &   0.8                        &  (5)  
      \medskip \\
      6   &  HD~172~555   &   $>$16                      &  (6)  
      \medskip \\
      7   &  HD~190~073   &   83                         &  (7)  
      \medskip \\
      8   &  HD~319~139   &   $\rm 0.49_{- 0.06}^{+  0.06}$  +
                             $\rm 0.33_{- 0.04}^{+  0.04}$  &  (8)  
      \medskip \\
      9   &  CD-43~344   &   ...                        &  (9)  
      \medskip \\
     10   &  FU~Ori A    &   466                        &  (10) 
      \medskip \\
     11   &  KK~Oph A    &   $\rm 20_{- 4}^{+  5}$          &  (11) 
      \medskip \\
     12   &  MP~Mus      &   $>$0.45                    &  (6)  
      \medskip \\
     13   &  PDS~144~S   &   $>$16                      &  (6)
      \smallskip \\
    \hline
  \end{tabular}}
  \medskip
\par
           References: (1)~Folsom et~al.\ (\cite{Folsom}), 
           (2)~Prato et~al.\ (\cite{Prato}), (3)~Lisse et~al.\ (\cite{Lisse}), (4)~neither distance nor the spectral type 
           are certain, (5)~Natta et~al.\ (\cite{Natta}), (6)~lower limit 
           when assuming a ZAMS luminosity for the given spectral types, 
           (7)~Acke et~al.\ (\cite{Acke05}), (8)~Quast et~al.\ (\cite{Quast}), (9)~no luminosity class is known, 
           (10)~Green et~al.\ (\cite{Green}), (11)~adapted by Carmona et~al.\ (\cite{Carmona}).
\end{table}