\begin{table}%t1
%\centering
\par
\caption{\label{tab:spec}Transition spectroscopic parameters.}
\vspace{-2mm}
\begin{tabular}{lccccl}
\hline \hline
Transition & Frequency & Error & $E_l$  & $A$ & Ref. \\
&   MHz      & MHz    & cm$^{-1}$  &  10$^{-2}$~s$^{-1}$ & \\
\hline
\OHp $N = 1- 0$ \\
 $2,5/2{-}1,3/2$ & 971803.8  & 1.5 & 0.0  & 1.82& 1 \\
 $2,3/2{-}1,1/2$ & 971805.3  & 1.5 & 0.0  & 1.52& 1 \\
 $2,3/2{-}1,3/2$ & 971919.2  & 1.0 & 0.0  & 0.30& 1 \\
\hline
o-\HHOp $1_{1,1}{-}0_{0,0}$\\
 $3/2,3/2{-}1/2,1/2$ &  1115122.0& 10&0.0  &1.71   & 2 \\
 $3/2,1/2{-}1/2,1/2$ &  1115158.0 &10&0.0  & 2.75 & 2\\
 $3/2,5/2{-}1/2,3/2$ & 1115175.8 & 10&0.0  & 3.10 & 2\\
 $3/2,3/2{-}1/2,3/2$ &  1115235.6& 10&0.0 & 1.39& 2\\
 $3/2,1/2{-}1/2,3/2$ &  1115271.6& 10&0.0  & 0.35& 2\\
\hline
%\smallskip
p-\HHOp  $1_{1,0}-1_{0,1}$\\
 $3/2,3/2{-}3/2,3/2$ & 607207.0 & 20 & 20.9  & 
0.60 &2 \\
%\hline
\HHHOp\\
$0_{0}^{-} - 1_{0}^{+}$ & 984711.9 & 0.3 &  5.1 & 2.3 & 3\\
\hline
\end{tabular}\vspace{-2mm}
\tablebib{1, M\"uller et~al. (\cite{Muller2}) \&  CDMS; 2, Strahan et~al. (\cite{Strahan86}), Ossenkopf et~al. (\cite{Ossenkopf10}); 3 Yu et~al. (\cite{Yu09}) \& JPL catalog.}
\vspace{-3mm}
\end{table}