\begin{table}%t1
  %\centering
\par
  \caption {\label{tab:res}Column densities of nitrogen hydrides towards \iras.}
  \begin{tabular}{l c c c c c c c c c c c}\hline\hline
  \noalign{\smallskip}
    Species & Transition & Component\tfm{a}  & 
    Frequency& HPBW & $T_{{\rm C},mb}$\tfm{b} 
    & $T_l$\tfm{c}
    & \tauk & \texc & $FWHM$\tfm{d} & $N_{\rm tot}$ \\
    &            & & GHz  & arcsec & K &K && K & \kms & \dix{14}~\cc \\
    \hline
    NH\tfm{e}& $0_1\ra1_0$ & $\frac{3}{2},\frac{5}{2}\ra\frac{1}{2},\frac{3}{2}$
    &  946.476 & 23 & 0.8  &  $-3.8\pm0.6$  & $2.8\pm0.7$ & 9.5 & $0.60$ & $2.20\pm0.80$   \\
    o-{NH$_2$}  & $0_{00\frac{1}{2}}\ra1_{11\frac{3}{2}}$ & $\frac{3}{2},\frac{5}{2}\ra\frac{5}{2},\frac{7}{2}$
    &  952.578 & 23 & 0.9  &  $-9.0\pm0.5$ & $12.8\pm0.7$ & 8.5 & $0.60$ & $0.40\pm0.06$\\ 
    & $0_{00\frac{1}{2}}\ra1_{11\frac{1}{2}}$ & $\frac{3}{2},\frac{5}{2}\ra\frac{3}{2},\frac{5}{2}$
    & 959.512 & 22 & 0.9  &  $-2.5\pm0.2$ & $4.9\pm0.7$ & 9.5 & $0.60$ & $0.59\pm0.12$\\
    p-\nhhh & $1 {-} 2$ & $(1,-) {-} (1,-)$  & 1168.453 & 18 & 1.2  & &$300{-}70$  &  $8{-}10$ & 0.50 & $200{-}35$\\
    o-\nhhh & $1 {-} 2$ & $(0,+) {-} (0,+)$  & 1214.853 & 18 & 1.3  & &$470{-}130$ &  $8{-}10$ & 0.50 & $200{-}35$\\
    p-\nhhh & $1 {-} 2$ & $(1,+) {-} (1,+)$  & 1215.246 & 18 & 1.3  & &$330{-}80$  &  $8{-}10$ & 0.50 & $200{-}35$\\
    p-\nhhh & $2 {-} 3$ & $(2,-) {-} (2,-)$  & 1763.823 & 12 & 2.2  & &$2.0{-}1.4$ &  $8{-}10$ & 0.50 & $200{-}35$\\
    \hline
%    o-\nhhh & $2 - 3$ & $(0,+) - (0,+)$  & 1763524.266 & 12 & 2.2  &  & 0.50 & 3.80 &  $8-10$ & $200-35$\\
%    p-\nhhh & $2 - 3$ & $(1,+) - (1,-)$  & 1763601.209 & 12 & 2.2  &  & 0.50 & 3.80 &  $8-10$ & $200-35$\\
  \end{tabular}
    \tfoot{ \tft{a} {For NH, the quantum numbers for the rotational
      transition $N_J$ are $\vec{F}_1=\vec{I}_{\rm H}+\vec{J}$ and
      $\vec{F}=\vec{I}_{\rm N}+\vec{F}_1$ \citep{klaus1997}. For the 
      $N_{K_aK_cJ}$
      rotational transition of {NH$_2$}, the quantum numbers are
      $\vec{F}_1=\vec{I}_{\rm N}+\vec{J}$ and $\vec{F}=\vec{I}_{\rm H}+\vec{F}_1$
      \citep{muller1999}. In the case of ammonia, quantum numbers are
      given separately for $\vec{J}=\vec{N}+\vec{S}$ and $(K,\epsilon)$, where
      $\epsilon$ is the symmetry index \citep[see][]{maret2009}. {For
        these lines, the frequency given is that of the brightest HF
        component.}}  
	\tft{b}{Single-sideband continuum in a
      \tmb\ scale.} 
      \tft{c} {{$T_l =     \tauk[J_\nu(\texc)-J_\nu(\tcmb)-T_{{\rm C},mb}]$ from the HFS
        fit. In the case of ammonia, see Sect.~3.}} 
	 \tft{d}{A
      conservative uncertainty of 0.25~MHz (0.08~\kms) imposed by the
      HIPE 2.8 pipeline was retained.} 
       \tft{e}{The integrated line
      opacity is calculated as $\int \tau \ud v = 1.06~ FWHM \times      \tauk$.}  \tft{d}{\cite{bacmann2010}}.}
      \vspace*{-3mm}
\end{table}