\begin{table}%t4
\caption{\label{table +comb. 2nd spectral survey}Observational strategy 2006/07.}
%\centering
\par
\begin{tabular}{ccccc}
\hline \hline      \noalign{\smallskip}
Position	& \multicolumn{4}{c}{Angular sensitivity $\theta$}\\
&2--5\arcmin& 5--10\arcmin& 10--15\arcmin	&	15--30\arcmin   \\
\hline  
A& AB+AD & AD&AD&AD\\
B& BC+BA &BC&BC&--\\
C& CD+CB &CD+CB&CB&--\\
D& DA+DC &DA+DC&DA&DA\\
\hline
\end{tabular}
\tablefoot {Different combinations of signal and reference positions are sensitive to different angular sizes of the primordial perturbations.}
\end{table}