\begin{table}%t1
\caption{List of observations using the Plateau de Bure Interferometer.
In the column of the configuration, the abbreviation of  e.g.\ ``5D''
refers to the number of antennas and the used configuration.}
\label{obspara}
%\centering
\par
\begin{tabular}{c c c c c c c c }
\hline\hline  
Line  & Transition &  Frequency &Configu- & Baseline  & Integration   &  Synthezied beam  & 1$\sigma$ rms\\
          &                    &     [MHz]       &ration     &  range [m] &  time ($T_{\rm ON}$)  [h]       &   size, position angle &  [mJy/beam] \\
\hline
HCO$^+$     &1--0                                                     & 89~188.523 & 5D,C2   &  24--175  & 5.9+10   &    5.2$''$ \x\ 4.8$''$, 6$^\circ$ &  18 \\          %   MA13
HCN       &  $J=1{-}0$, $F=2{-}1$                        &  88~631.847&6CD &  24--175 & 5.9           & 6.0$''$ \x\ 4.2$''$, 105$^\circ$  &  24 \\      %   LA31  sub
CS                 & 2--1                                                    & 97~980.950 & 5D    &  24--160   & 1.8          & 9.0$''$ \x\ 4.2$''$, 120$^\circ$   & 170\\        %   MB13
C$_2$H & $N$ = 1--0,  $J$ = 3/2--1/2, $F$ = 2--1 & 87~316.925 & 6D    & 24--113 & 1        &  9.8$''$ \x\ 3.9$''$, 110$^\circ$  & 37 \\          %   LB31 l03
CH$_3$OH &15$_{(3,13)}{-}$14$_{(4,10)}$ A$^+$    & 88~594.960 & 6CD &   24--175 & 3.9         &  6.1$''$ \x\ 4.2$''$, 105$^\circ$  &  24\\       %   LA31 ch3oh886_a2 L02
CH$_3$OH &15$_{(3,12)}{-}$14$_{(4,11)}$ A$^-$     & 88~940.090 & 5D    &   24--175 & 3.9+2.2  &  6.3$''$ \x\ 4.3$''$, 105$^\circ$  &  24\\         %   LA31, L03 + MA13,L02
CH$_3$OH &   2$_{(1,1)}{-}1_{(1,0)} {\rm A}^-$                    & 97~582.830 & 5D    &   32--73   & 1.8          &  9.4$''$ \x\ 4.3$''$, 148$^\circ$   & 170  \\        %   MB13
\hline
\end{tabular}
\end{table}