\begin{table}%t4
\caption{\label{second_tab}Spectroscopic properties  of the FIRBACK 
identified sources.  
The quoted uncertainty for velocities is the internal (1$\sigma$) error, 
and does not include the systematics (see text). 
Emission (or absorption) lines shown in brackets are seen, but not used 
for the velocity determination because of poor S/N. 
The H$\alpha$ flux is given, when conditions were photometric, in units of 
10$^{-16}$~erg/cm$^{2}$/s. For  source FN1-040, 
$z = 0.45$, see Chapman et~al. (2002).}
\par
 {%\centerline
{
\begin{tabular}{ccccccc}  
\hline \hline 
ID& Coordinates$^a$ & $cz$ (km~s$^{-1}$)   & $r'$ Mag. &  Emission (H$\alpha$ flux)& Absorption& Comments\\ \hline
FN1-000 & 160552.8$+$540651 &43~604 $\pm$ 87 &17.94 & H$\alpha$(183), [NII],  [OI], [NI], H$\beta$, [OIII] & Na& Liner \\ 
        &                   &              &      & H$\gamma$, [OII], (HeI)                              &   &  \\ 
FN1-001 & 160736.6$+$535730 &9004 $\pm$ 51  &16.67 & H$\alpha$(93.9), [NII], [SII], H$\beta$, [OIII], HeI& Na, Ca, (Mg), G, H, K& \\ 
FN1-002 & 161005.8$+$541029 &19~119 $\pm$ 119&17.73 & H$\alpha$(13.9), [NII], [SII], H$\beta$, [OII]& Na, Mg, G, H, K& \\ 
FN1-003 & 161254.1$+$545526 &19~481 $\pm$ 90 &17.13 & H$\alpha$(21.7), [NII], [SII], [OII]& Na, (H$\beta$), Mg, Ca, G, H, K& Em. with small EW \\ 
FN1-004N& 161109.5$+$535807 &19~107 $\pm$ 85 &16.84 & H$\alpha$(9.5), [NII], [SII], [OIII]& Na, H$\beta$, G, Mg& Sey2, [NII]/H$\alpha$ $>$ 1\\ 
FN1-004S& 161107.2$+$535711 &19~208 $\pm$ 88 &19.03 & H$\alpha$(5.5), [NII], [SII]& Na, G&\\ 
FN1-005 & 160443.4$+$543331 &86~400$^b$     & 19.22&                             &&\\ 
FN1-006 & 160433.9$+$544432 &22~608 $\pm$ 63 &17.26 & H$\alpha$(34.8), [NII], [SII], [OII]& Na, Mg, H$\beta$, G, H$\delta$, H, K&\\ 
FN1-007 & 161331.2$+$541630 &18~435 $\pm$ 41 &17.18 & H$\alpha$(59.1), [NII], [SII], [OII]& Na, G, H, K& \\ 
FN1-009 & 160803.7$+$545302 &15~746 $\pm$ 865& 16.58& H$\alpha$(17.0), [NII], [SII] & Na, Mg, Ca, H$\beta$, H$\gamma$, H$\delta$ & Liner \\ 
        &                   &              &      &   [OI], [OIII], [OII]& G, H, K&  \\ 
FN1-011 & 160808.6$+$535242 &19~326 $\pm$ 48 &17.84 & H$\alpha$, [NII], [SII], H$\beta$& Na, Ca, G, (H), K&\\ 
FN1-012 & 161214.0$+$540833 &19~770 $\pm$ 73 &17.88 & H$\alpha$(32.7), [NII], [SII], H$\beta$, [OIII], [OII]& Na, Mg, Ca, H, K&\\
FN1-014 & 161551.4$+$541536 &21~000$^c$     & 19.20&                   & &\\ 
FN1-015 & 160724.7$+$541212 &70~183 $\pm$ 58 &18.89 & H$\beta$, [OII]& H, K&\\ 
FN1-016 & 16-738.0$+$544602 &27~579 $\pm$ 85 &17.09  & H$\alpha$(48.7), [NII], [OII]& Na, (H$\beta$), (H$\gamma$), H$\delta$, H, K& \ \\ 
FN1-018 & 161407.1$+$541920 &25~598 $\pm$ 105&18.92  & H$\alpha$(7.9), [NII], ([OIII]), [OII]& Na& AGN ([NII]/H$\alpha$ $\sim$ 1) \\ 
FN1-020 & 160812.3$+$545526 &3000$^c$      &19.72  &                 &&\\ 
FN1-021 & 161308.0$+$545142 &19~349 $\pm$ 39 &18.18  & H$\alpha$, [NII], [SII], H$\beta$& Na& \\ 
FN1-021B& 161319.2$+$545138 &19~983 $\pm$ 18 & 18.04 & H$\alpha$, [NII], [SII], H$\beta$, [OIII]& & \\ 
FN1-023& 160835.4+535020 &18~780 $\pm$ 26 &18.94 & H$\alpha$(26.1), [NII], [SII], H$\beta$, [OIII], [OII]& Na&\\ 
FN1-024& 160937.5+541259 &25~770 $\pm$ 60 &18.36 & H$\alpha$(20.1), [NII], H$\beta$, ([OII])& Na&\\ FN1-026& 161436.9+541635 &23~835 $\pm$ 12 &19.10 & H$\alpha$(4.8), [NII]& (Na), (H$\delta$)&\\ 
FN1-031& 161103.7+544322 &18~840 $\pm$ 78 &17.69 & H$\alpha$(8.6), [NII], [SII], ([OIII])& H, K& \\ FN1-033& 161301.1+541003 &41~173 $\pm$ 65 &18.47 & H$\beta$, [OII]& Na, G, H, (K)& \\ 
FN1-035& 161527.7+543414 &40~820 $\pm$ 72 &18.11 & H$\alpha$, [NII], [OII]& Na, Mg, (H$\beta$), H, K&\\ 
FN1-038& 160747.3+534836 &32~192 $\pm$ 20 &19.26 & H$\alpha$(10.1), [NII], [SII], H$\beta$, [OIII]& & \\ 
FN1-039& 160848.9+545151 &80~700$^b$     &20.18 &                              & & \\ 
FN1-041& 160814.2+542836 &35~995 $\pm$ 46 &18.89 & H$\alpha$, [NII], H$\beta$, [OIII], H$\gamma$& & \\ 
FN1-043& 160553.4+542226 &63~470 $\pm$ 53 &18.69 & H$\alpha$, [NII], [OII]& (G), H&\\ 
\hline
\end{tabular}}}
\medskip
$^a$  J2000 position of the optical counterpart.\\
$^b$  Chapman (private communication).\\
$^c$  Photometric estimate (\citealt{babb04}). %\vspace*{2mm}
\end{table}