\begin{table}%T4
%\centering
\par
\caption{Statistics on the overlap of maser species, radio continuum emission
          and IRAS emission. The third column gives the percentage of sources with
          masers in two or three of the maser species (OH, H$_2$O, and CH$_3$OH)
          with respect to the total number of sources studied~(79).
          The fifth and seventh columns are the percentages of radio and IRAS~counterparts, respectively, with respect to the number of maser sources
          given in the second column.}\label{t4}
\begin{tabular}{l c c c c c c}
\hline
\hline
 Overlap & $N_{\rm maser}$ & \%  & $N_{\rm radio}$ &  \% & $N_{\rm IRAS}$ & \% \\
\hline
OH/CH$_3$OH/H$_2$O  &   9  &   11   &  4   &  44  & 5 & 56 \\
OH/CH$_3$OH         &  12  &   15   &  4   &  33  & 4 & 33 \\
CH$_3$OH/H$_2$O     &  26  &   33   & 10   &  38  &14 & 54 \\
CH$_3$OH            &  32  &   41   &  6   &  19  &18 & 56 \\
\hline
\end{tabular}
\end{table}