\begin{table}%t2
%\centering
\par
\caption {Values of $\ln(N_{\rm up}/g_{\rm up})$, derived from ISOCAM observations of H$_2$ rotational lines in L1157 (uncorrected for reddening), for the two brightest pixels of the knot~B1 and also for a $3\times 3$~pixel area which comprises the two peaks. The pixel size is~6\arcsec, which corresponds to 2600~AU at the distance of L1157.
\label{tA1}}
\begin{tabular}{ccccc}
  \hline\hline
  Transition & $E_{\rm up}$~(K) & pix1 & pix2 & $3\times 3$ \\
  \hline
  0--0~S(2) & 1681.68 & 40.33 & 40.79 & 40.18 \\
  0--0~S(3) & 2503.87 & 38.80 & 39.20 & 38.64\\
  0--0~S(4) & 3474.43 & 37.55 & 37.98 & 37.14 \\
  0--0~S(5) & 4586.38 & 37.05 & 36.85 & 36.46 \\
  0--0~S(6) & 5829.76 & 35.92 & 35.70 & 34.54 \\
  0--0~S(7) & 7197.00 & 34.95 & 34.07 & 33.69 \\
  \hline
\end{tabular}
\end{table}