\begin{table}%t2
%\centering
\par
\caption{\label{t:sources}Observational parameters.}
\begin{tabular}{lcccc}
\hline \hline \noalign{\smallskip}
Source   & Filter  & $\lambda_{\rm c}$ & $\Delta \lambda$ & Exp.   \\
         &         & [{\AA}]          & [{\AA}]          & [s]\\
\hline
R Scl       & $f475$  &  4760 & 1458 & 1734   \\
            & $f606$  &  5907 & 2342 & 1206\tablefootmark{(a)}  \\
            & $f814$  &  8333 & 2511 & 1206\tablefootmark{(a)}  \\
HD1760   & $f475$  &       &      & \phantom{1}820\phantom{a}  \\
            & $f606$  &       &      & \phantom{1}330\phantom{a} \\
            & $f814$  &       &      & \phantom{1}330\phantom{a}  \\
U Cam       & $f606$  &       &      & 1060\phantom{a}  \\
            & $f814$  &       &      & 1060\phantom{a}  \\
HD20797   & $f606$  &       &      & 1050\phantom{a}  \\
            & $f814$  &       &      & 1050\phantom{a}  \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{Observed with this exposure time in two rotation angles of the satellite.}}
\end{table}