**Table 4:** Air wavelengths, upper energy levels, Eistein A coefficients, degeneracies and line fluxes of the H₂ lines detected in M1-78. We also give significant line flux ratios and results such as the ortho-to-para ratio ( $\phi$ ) and the excitation temperature.
Transition	$\lambda_{ j}$	E_j	A_j	g_j	Slit 1 ^a				Slit 2 ^a
	( $\mu$ m)	(K)	(10^-7 s)		Region 1	Region 2	Region 3	Region 4	Region 1	Region 2	Region 3
1-0 S(2)	2.0332	7584	3.98	9	35.3 $\pm$ 2.6	18.5 $\pm$ 1.9	10.4 $\pm$ 1.1	26.3 $\pm$ 1.1	8.0 $\pm$ 1.4	2.9 $\pm$ 0.7	5.3 $\pm$ 1.0
2-1 S(3)	2.0729	13 890	5.77	33	16.7 $\pm$ 1.9	9.9 $\pm$ 1.1	4.6 $\pm$ 0.6	22.3 $\pm$ 1.1	5.9 $\pm$ 1.1	<3	3.1 $\pm$ 0.7
1-0 S(1)	2.1212	6956	3.47	21	148.6 $\pm$ 10.4	92.3 $\pm$ 1.4	48.5 $\pm$ 1.2	150.8 $\pm$ 3.6	44.5 $\pm$ 2.3	19.1 $\pm$ 0.8	30.1 $\pm$ 1.9
2-1 S(2)	2.1536	13 152	5.60	9	<3.5	<4.2	<2.5	10.7 $\pm$ 1.1	3.6 $\pm$ 0.9	<2	<3
3-2 S(3)	2.2008	19 086	5.63	33	5.7 $\pm$ 1.4	<4.2	<2.2	8.5 $\pm$ 2.3	<3	<3	<2
1-0 S(0)	2.2229	6471	2.53	5	33.8 $\pm$ 3.8	28.5 $\pm$ 2.2	16.6 $\pm$ 0.8	38.3 $\pm$ 1.7	11.6 $\pm$ 1.5	6.9 $\pm$ 1.0	<5
2-1 S(1)	2.2471	12 550	4.98	21	15.1 $\pm$ 2.2	9.3 $\pm$ 1.1	4.2 $\pm$ 0.7	16.3 $\pm$ 1.6	5.0 $\pm$ 1.1	<4	4.0 $\pm$ 1.1
3-2 S(2)	2.2864	18 386	5.63	9	<3.3	11.6 $\pm$ 1.3	4.0 $\pm$ 0.6	<4.5	<3	4.4 $\pm$ 1.0	2.3 $\pm$ 1.0
1-0 S(1)/2-1 S(1)					9.8 $\pm$ 1.6	9.9 $\pm$ 1.2	11.5 $\pm$ 1.9	9.2 $\pm$ 0.9	8.6 $\pm$ 1.9	>4	7.5 $\pm$ 2.1
1-0 S(1)/3-2 S(3)					26.1 $\pm$ 6.6	>22	>22	17.6 $\pm$ 4.8	>17	>7	>15
$\phi_1$					3.5 $\pm$ 0.3	3.1 $\pm$ 0.2	2.9 $\pm$ 0.2	3.7 $\pm$ 0.1	3.6 $\pm$ 0.4	3.3 $\pm$ 0.4	^b
$\phi_2$					$\vartriangle$	$\vartriangle$	$\vartriangle$	2.0 $\pm$ 0.2	1.7 $\pm$ 0.4	^c	^c
$T_{\rm ex}$ (K) ^e					980 $\pm$ 165	720 $\pm$ 55	690 $\pm$ 20	720 $\pm$ 150	750 $\pm$ 175	570 $\pm$ 55	590 $\pm$ 120
$T_{\rm ex}$ (K) ^f					2255 $\pm$ 230	2100 $\pm$ 260	1910 $\pm$ 330	2465 $\pm$ 390	2380 $\pm$ 330	^d	2265 $\pm$ 420

^a Line fluxes are given in units of 10^-18 W m^-2. ^b The 1-0 S(0) line was not been measured. ^c Only one or two v=2 lines were detected. ^d There are only upper limits for the v=2 transitions. ^e Excitation temperature determined from the v=1 states only. ^f Excitation temperature determined from the v=1 and v=2 states.

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