\begin{table}%t2
\caption{List of participating near-IR observatories by longitude and number
of observations performed in the various bands.}\label{obs_ir}
%\centering
\par
\begin{tabular}{l c |c c c| c}
\hline \hline
Observatory&$d$ (cm)&$N_J$&$N_H$&$N_K$&$N_{\rm tot}$\\
\hline
Campo Imperatore, Italy   &110 &82 (82)&81 (81)&88 (87)&251 (250)\\
TIRGO, Switzerland        &150 &59 (1) &1  (1) &55  (1)&115 (3)\\
Roque (NOT), La Palma     &256 &6  (6) &5  (5) &8   (8)&19 (19)\\
\hline
Total                     &    &147 (89)&87 (87)&151 (96)&385 (272)\\
\hline
\end{tabular}
\end{table}