\begin{table}%t2
\caption{Determinations of the geometric albedo of 21 Lutetia.}\label{albedo_tab}
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%\centering
\par
\begin{tabular}{lcc}
%\noalign{\smallskip}
\hline
\hline
\noalign{\smallskip}
Author & Method & Albedo \\
\hline
Tedesco \& Veeder (\cite{Tedesco92}) & Thermal & 0.221 $\pm$ 0.02 \\
Zellner \& Gradie (\cite{Zellner76}) & Pol. (h) & 0.10 \\
Lupishko \& Mohamed (\cite{Lupishko96}) & Pol. & 0.10 \\
Magri et~al. (\cite{Magri99}) & Radar & 0.19 $\pm$ 0.07 \\
Mueller et~al. (\cite{Mueller06}) &Thermal & 0.208 $\pm$ 0.025 \\
Gil-Hutton (\cite{Gil-Hutton07}) & Pol. ($P_{\rm min}$) & 0.11 $\pm$ 0.01 \\
Gil-Hutton (\cite{Gil-Hutton07}) & Pol. (h) & 0.20 $\pm$ 0.04 \\
Carvano et~al. (\cite{Carvano08}) & Thermal & 0.13 $\pm$ 0.03 \\
Shepard et~al. (\cite{Shepard08}) & Radio & 0.24 $\pm$ 0.07 \\
Weaver et~al. (\cite{Weaver09}) & Vis + 3D model & 0.16 $\pm$ 0.02\\
Belskaya et~al. (\cite{Belskaya10}) & Pol. (h) & 0.13/0.16 $\pm$ $0.02^{*}$ \\
This work & Vis + 3D model & 0.18 $\pm$ 0.02 \\ 
\hline 
\end{tabular}
\tablefoot{$^{*}$ $p_{V} = 0.13 \pm 0.02$ when using the calibration based on albedos of meteorites (Zellner \& Gradie \cite{Zellner76}) and $p_{V}$ = 0.16 $\pm$ 0.02 when using the calibration based on IRAS albedos (Cellino et~al. 1999).}
\end{table}