Table A.1: Values of $\ln(N_{\rm up}/g_{\rm up})$ , derived from ISOCAM observations of H₂ 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 $^{\prime \prime }$ , which corresponds to 2600 AU at the distance of L1157.
Transition $E_{\rm up}$ (K) pix1 pix2 $3\times 3$

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

**Table A.1:** Values of $\ln(N_{\rm up}/g_{\rm up})$ , derived from ISOCAM observations of H₂ 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 $^{\prime \prime }$ , which corresponds to 2600 AU at the distance of L1157.
Transition	$E_{\rm up}$ (K)	pix1	pix2	$3\times 3$
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

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