\begin{table}%t2
\caption{\label{tab:fit}Fitted column density, excitation temperature, line width and position per component (see Sect.~\ref{sec:specfit}).}\vspace{-2mm}
\par
%\centering
\par
\begin{tabular}{lcllllc}
\hline
\hline \noalign{\smallskip}
Species           & Component               & $N({\rm X})$ & $T_{\rm ex}$ & $\Delta v$ & $v_{\rm lsr}$ & $N({\rm X})/N_{\rm H}$ \\
                  &                         & [cm$^{-2}$] & [K] & [km s$^{-1}$] & [km s$^{-1}$] & \\
\hline  \noalign{\smallskip}                                       
CH                &     \textbf{ CENTER }    & 4.0(14)    &  6.6       & 4.4     & $-5.9 $ & 4(-9)$^{b}$  \\
CH$^+$            &                          & 8.5(12)    &  38.4      & 7.0     & $-4.6 $ & 9(-11)$^{b}$ \\
\hline 
CH                &     \textbf{ RED }       & 2.6(14)    & \ldots$^a$ & 1.8     & $-0.2 $ & 2(-8)$^{c}$  \\
CH$^+$            &                          & 1.2(14)    & \ldots     & 15.0    & $ 1.6 $ & 1(-8)$^{c}$  \\
H$_2$O$^+$        &                          & 8.3(12)    & \ldots     & 4.5     & $ 2.2 $ & 7(-10)$^{c}$ \\
OH$^+$            &                          & 6.1(13)    & \ldots     & 5.1     & $ 2.8 $ & 5(-9)$^{c}$  \\
NH 974 GHz        &                          & 1.5(13)    & \ldots     & 1.5     & $-0.2 $ & 1(-9)$^{c}$  \\
NH 999 GHz        &                          & 1.5(13)    & \ldots     & 1.5     & $-0.1 $ & 1(-9)$^{c}$  \\
\hline \noalign{\smallskip}
CH$^+$            &     \textbf{ BLUE }      & 1.8(14)    &  8.0       & 6.0     & $-17.1$ & 4(-9)$^d$    \\
H$_2$O$^+$        &                          & 5.4(12)    & \ldots     & 13.5    & $-16.4$ & 1(-10)$^d$   \\
OH$^+$            &                          & 1.6(13)    & \ldots     & 12.4    & $-16.1$ & 3(-10)$^d$   \\
NH 974 GHz        &                          & 1.9(13)    & \ldots     & 5.7     & $-12.4$ & 4(-10)$^d$   \\
NH 999 GHz        &                          & 3.8(13)    & \ldots     & 4.0     & $-10.4$ & 8(-10)$^d$   \\
\hline
\end{tabular}
\tablefoot {Fractional abundances are given relative to $N_{\rm H} = N({\rm H}) + 2 N({\rm H}_2)$. $A(B) \equiv A \times 10^B$. \\
\tablefoottext{a}{Fixed at 3 K;}
\tablefoottext{b}{using $N_{\rm H} \sim 10^{23}$ cm$^{-2}$, see text;}
\tablefoottext{c}{using $N_{\rm H} \sim 1.2 \times 10^{22}$ cm$^{-2}$ (\citealt{Minh08});}
\tablefoottext{d}{using $N_{\rm H} \sim 4.6 \times 10^{22}$ cm$^{-2}$ (\citealt{Mitchell89}).}}\vspace{-5mm}
\end{table}