\begin{table}%t7   
\caption{\label{tab:twocolour}Spectral type statistics in five samples$^{(a)}$.}  
\small%\centerline
 {           
\begin{tabular}{l|rrrr|rrrrrr}                       
\hline                                     
\hline 
%&&&&&&&&&& \\[-8pt]                                    
    & \multicolumn{2}{c}{ATESP} & \multicolumn{2}{c|}{M-G} & \multicolumn{2}{c}{Tuc} & \multicolumn{2}{c}{Sad} & \multicolumn{2}{c}{M}    \\ 
    & \multicolumn{2}{c}{${>}0.6$ mJy} & \multicolumn{2}{c|}{${>}500$ mJy} & \multicolumn{2}{c}{${>}20$ mJy} & \multicolumn{2}{c}{${>}100$ mJy} & \multicolumn{2}{c}{${>}500$ mJy}  \\ 
  & \multicolumn{4}{c|}{(percent)} & \multicolumn{6}{c}{(percent)} \\
\hline
U &   9 & $\pm$5  & 8 & $\pm$5 & 29 & $\pm$6 & 22 & $\pm$5 &  10 & $\pm$1 \\
I  & 13 &   7 & 12 &   6 &   7 &  3 & 20 &   4 & 28 &   5  \\
S & 61 & 14 & 47 & 11 & 53 &  7 & 34 &   6 & 30 &   5 \\
P & 17 &   8 & 33 & 11 & 11 &  3 & 24 &   5 & 32 &   5 \\  
\hline
\end{tabular}}
\medskip
$^{(a)}$ ATESP 5~GHz sample (26 sources);  Massardi \etal\  galaxy sample (M-G, 36~sources); Tucci \etal\  (\cite{Tuc08}) sample (Tuc, 102~sources);  Sadler \etal\  (\cite{Sad06}) sample (Sad, 101~sources) Massardi \etal\  (\cite{Mas08}) overall sample (M, 218~sources).
\end{table}