\begin{table}%t1
%\centering
\par
\caption{\label{table:anchorpoints}Anchor points of the continuum splines.} 
\par
\tiny\begin{tabular}{ccc}
\hline\hline\noalign{\smallskip}
Feature & \multicolumn{2}{c}{Anchor Points}        \\
%\hline
& Class B/C sources &     Class A sources  \\
\um     &     \um         &     \um                \\
\hline
6.2  & 5.7, 5.9, 6.1, 6.5, 6.7, 6.9            & idem \\
7.9  & 7.0, 7.2, 7.4, 9, 9.2, 9.4              & 6.6, 6.8, 7.0, 9.0, 9.2, 9.4 \\
11.2 & 10.3, 10.5, 10.7, 11.8, 12.0, 12.2      & idem \\  
\hline
\end{tabular}
\end{table}