\begin{table}%t3
%\centering
\par
\caption{Measured data (Only a few lines at the beginning of  Table~3a,
as examples).\label{tab3}}
\begin{tabular}{lcccccc}
\hline\hline
  alf Tau  &     &        &      &    &      &     \\
  --------  &     &        &      &    &      &     \\
 Isotope & $v$\arcmin\  $v$\arcsec\ & Rot. tr. & nu(cm-1)  & log {\it gf} & L.E.P.(cm$^{-1}$) & 
 log~{\it EW}/nu \\
\hline
  C12O16 &  3   1 &  P    2 &      4199.480 & --6.282 &   2154.701 & --4.739 \\
  C12O16 &  2   0 &  P    9 &      4222.953 & --6.128 &    172.978 & --4.585 \\
  C12O16 &  4   2 &  R   68 &      4237.805 & --4.241 &  12982.145 & --4.721 \\
 C12O16  & 3   1  & R    8  &     4238.289 & --5.600  &  2280.402 & --4.611\\  
  C12O16 &  4   2  & R   36 &      4243.637 & --4.604  &  6763.398 & --4.608\\
  C12O16 &  3   1  & R   18 &      4266.090 & --5.248  &  2794.075 & --4.572\\
  C12O16 &  3   1 &  R   22  &     4275.180 & --5.154  &   3105.648 & --4.553\\
  C12O16 &  2   0 &  R   92  &     4292.047 & --4.817 &  16004.551 & --5.067\\
  C12O16 &  3   1 &  R   32  &     4292.750 & --4.969 &   4148.160 & --4.563\\
  C12O16 &  3   1 &  R   35  &     4296.566 & --4.923 &   4533.898 & --4.595\\
  \hline
\end{tabular}
\end{table}