\begin{table}%t2
%\centering
\par
\caption{Relevant parameters of the calibrators used
for VINCI observations of Altair. \label{calib_params}}
\begin{tabular}{lcccc}
\hline\hline
Name & 24~Cap & $\chi$~Phe & 70~Aql & $\alpha$~Ind\\
HD number & \object{HD 200914} & \object{HD 12524} & \object{HD 196321} & \object{HD 196171} \\
\hline
\par
\noalign{\smallskip}
\par
$m_{\rm V}$ & 4.5 & 5.2 & 4.9 & 3.1 \\
$m_{\rm K}$ & 0.5 & 1.3 & 1.2 & 0.9 \\
Sp. type & M0.5III & K5III & K5II & K0III \\
$T_{{\rm eff}}$ (K)$^{{a}}$ & 3630 & 3780 & 3780 & 4720 \\
$\log g ^{{\rm a}}$ & 1.4 & 1.9 & 1.9 & 2.6 \\
$[{\rm Fe}/{\rm H}]^{{c}}$ & -- & -- & -- & 0.0 \\
$v_{\rm eq} \sin i$ (km~s$^{-1}$)$^{{d}}$ & -- & -- & 1.9 & -- \\
$\oslash_{\rm LD}$ (mas)$^{{a}}$ & $4.43 \pm 0.05$ & $2.77 \pm 0.03$ & $3.27 \pm 0.04$ & $3.28 \pm 0.03$ \\
$\oslash_{\rm UD}$ (mas)$^{{b}}$ & $4.30 \pm 0.05$ & $2.69 \pm 0.03$ & $3.17 \pm 0.04$ & $3.20 \pm 0.03$ \\
\hline
\end{tabular}
\par
\begin{list}{}{}
\par
\item[$^{{a}}$] From Cohen et~al.~(\cite{Cohen1999}).
\item[$^{{b}}$] Limb-darkened disc diameters
$\oslash_{\rm LD}$ converted to uniform disc diameters
$\oslash_{\rm UD}$ using the linear limb-darkening coefficients
from Claret~(2000a).
\item[$^{{c}}$] From Cayrel de Strobel
et~al.~(\cite{Cayrel de Strobel1997}, 2001).
\item[$^{{d}}$] From Glebocki et~al.~(\cite{Glebocki2000}).
\end{list}
\par
\end{table}