\begin{table}%t1
  \caption{\label{calibrators}Calibrators used for the observations. "SP'' stands
    for spectral type. Uniform Disk diameters, given in mas, are only
    intended for computing the expected squared visibility in the $K$~band.  }
    \small%\centerline
{
      \begin{tabular}{lllcc}
	\hline\hline
	 & SP & UD diam. & Baseline &  Notes\\
	\hline
	\object{HD~5848}   & K2 II-III & $2.440_{\pm0.064}$ & S1-S2 & B02, 1\\
	\hline
	\object{HD~5848}   & K2 II-III & $2.440_{\pm0.064}$ & E1-E2 & B02, 1\\
	\object{HD~81817}  & K3 III    & $3.260_{\pm0.085}$ &   --   &  --\\
	\object{HD~139669} & K5 III    & $2.890_{\pm0.035}$ &   --   &  --  \\
	\object{HD~222404} & K1 III-IV & $3.290_{\pm0.051}$ &   --   &  -- \\
	\hline
	\object{HD~83550}  & K2 III    & $1.160_{\pm0.015}$ & W2-E2 & M05, 1\\
	\object{HD~91190}  & K0 III    & $1.330_{\pm0.018}$ &   --   &  --\\
 	\object{HD~118904} & K2 III    & $1.411_{\pm0.018}$ &   --   &  --  \\
	\object{HD~176527} & K2 III    & $1.721_{\pm0.024}$ &   --   &  M05, 2\\
	\object{HD~218452} & K5 III    & $2.080_{\pm0.024}$ &   --   &  --\\
	\hline
	\object{HD~162211} & K2 III    & $1.598_{\pm0.020}$ & S2-W2 & M05, 2\\
	\object{HD~165760} & G8 III    & $1.500_{\pm0.020}$ &   --   &  --  \\
	\object{HD~207130} & K1 III    & $1.331_{\pm0.017}$ &   --   &  -- \\
	\object{HD~217673} & K1 II     & $1.411_{\pm0.020}$ &   --   &  --  \\
	\hline
	\object{HD~9022 }  & K3 III    & $1.050_{\pm0.014}$ & W1-E2 & M05, 1\\
	\object{HD~42855}  & K3 III    & $0.803_{\pm0.010}$ &   --   &  -- \\
	\object{HD~217673} & K1 II     & $1.411_{\pm0.020}$ &   --   &  --  \\
	\object{HD~206842} & K1 III    & $1.214_{\pm0.016}$ &   --   &  M05, 2\\
	\hline
      \end{tabular}}
      \smallskip
      Notes: B02 refers to \cite{Borde2002} catalog; M05 to
    \cite{Merand2005} catalog; 1 refers to Polaris observations and~2~refers to $\delta$~Cep ones.
 \end{table}