\begin{table}%t2
\caption{Calibrators with spectral type, $K$ magnitude, limb-darkened disk (LD) angular diameter in
$K$~band (in milliarcsec) and baseline \citep{Borde02,Merand05}.} \label{tab:calib} 
%\centering
\small
\begin{tabular}{ccccc}
\hline \hline               & S. type & $K$ mag & LD diam.\ (mas) & Baseline
\\ \hline \object{HD~159501} & K1 III   & 3.14   & $1.200 \pm 0.014$ & E2--W2
\\        \object{HD~163770} & K1 IIa   & 1.03   & $3.150 \pm 0.034$ & S1--S2
\\        \object{HD~165683} & K0 III   & 2.9    & $1.152 \pm 0.014$ & E2--W2
\\        \object{HD~168775} & K2 IIIab & 1.74   & $2.280 \pm 0.025$ & S1--S2
\\        \object{HD~173780} & K2 III   & 2.0    & $1.950 \pm 0.021$ & E2--W2
\\        \object{HD~176527} & K2 III   & 2.04   & $1.765 \pm 0.024$ & E2--W2
\\        \object{HD~176670} & K2.5 III & 1.6    & $2.410 \pm 0.026$ & S1--S2
\\ \hline
\end{tabular}
\end{table}