\begin{table}%t2
      %\centering
\par
            \caption{Reference sources. \label{tab:cal}}                
             \begin{tabular}{lccc}            \hline            \hline            \noalign{\smallskip}            HD number & Source  &  Spectral type & Uniform disk  \\	                 & name &                & diameter (mas)\\            \noalign{\smallskip}            \hline	    HD 6860   &~$\beta$~And    & M~0 III    &~$13.85\pm0.18$$^{{\rm d}}$\\	    HD 9927   & 51~And         & K3 III    &~$3.69\pm0.05$$^{{\rm b}}$\\	    HD 18884  &~$\alpha$~Cet   & M 1.5 III  &~$12.66\pm0.36$$^{{\rm a}}$\\	    HD 42995  &~$\eta$~Gem     & M~3 III    &~$10.64\pm0.53$$^{{\rm c}}$\\	    HD 44478  &~$\mu$~Gem      & M~3 III    &~$13.50\pm0.15$$^{{\rm d}}$ \\            HD 48329  &~$\epsilon$~Gem & G8 Ib     &~$4.14\pm0.21$$^{{\rm c}}$\\	    HD 61421  &~$\alpha$~CMi   & F5 IV     &~$5.25\pm0.26$$^{{\rm c}}$\\	    HD 62509  &~$\beta$~Gem    & K0 IIIb   &~$7.70\pm0.31$$^{{\rm d}}$\\	    HD 81797  &~$\alpha$~Hya   & K3 II-III &~$9.11\pm0.46$$^{{\rm c}}$\\	    HD 130144 & HR 5512        & M~5 III    &~$8.28\pm0.41$$^{{\rm c}}$\\	    HD 140573* &~$\alpha$~Ser   & $K$2 IIIb   &~$4.79\pm0.53$$^{{\rm a}}$\\	    HD 146051* &~$\delta$~Oph   & M~0.5 III  &~$9.73\pm0.10$$^{{\rm a}}$\\	    HD 183439* &~$\alpha$~Vul   & M~0 III    &~$4.27\pm0.05$$^{{\rm a}}$\\	    HD 187076* &~$\delta$~Sge   & M~2 II     &~$8.73\pm0.44$$^{{\rm c}}$\\	    HD 197989 &~$\epsilon$~Cyg & K0 III    &~$4.40\pm0.22$$^{{\rm c}}$\\	    HD 213310 & 5~Lac          & M~0 II     &~$5.13\pm0.26$$^{{\rm c}}$\\            \noalign{\smallskip}            \noalign{\smallskip}            \hline         \end{tabular}
             \begin{list}{}{}
             \item[$^{{\rm a}}~~$\cite{cohen96}.]
             \item[$^{{\rm b}}~~$\cite{cohen99}.]
             \item[$^{{\rm c}}$ Photometric estimate.]
             \item[$^{{\rm d}}~~$\cite{benedetto87}.]
             \end{list}   
             \end{table}