Table 1: The measured lines are given in Col. 3. The last column gives the ratio of the line intensity to H $\beta$ (=100).
Ident. $\lambda$ ( $\mu$ m) Intensity $^\dagger$ I/H $\beta^\sharp$

? 9.98 6.52 0.96

[S IV] 10.51 1665 321

H I 9-7 11.30 4.27 0.806

[Cl IV] 11.76 4.50 0.844

H₂ 12.28 3.53 0.65

H I7-6(11-8) 12.37 10.2 1.89

[Ne II] 12.81 235 43.5

[Ar V] 13.10 3.41 0.63

[Ne V] 14.31 2.78 0.51

[Cl II] 14.36 7.68 1.41

[Ne III] 15.55 2708 497

H₂ 17.03 1.83 0.336

[S III] 18.70 994 184

[Cl IV] 20.31 10.47 1.07

[Ar III] 21.81 41.0 4.19

[Fe III] 22.92 3.68 0.376

[Ne V] 24.31 3.89 0.396

[O IV] 25.87 900 91.5

[Fe II] 25.98 2.51 0.255

Hi9-8 27.78 2.66 0.27

[S III] 33.46 1185 120

[Si II] 34.80 158 16.0

[Ne III] 35.99 424 42.8

$^\dagger$ The intensity is measured in units of 10^-14 erg cm^-2 s^-1.
$^\sharp$ In the ratio of intensity to H $\beta$ the intensities below 19 $\mu$ m are multiplied by a factor 1.8 to correct for part of the nebula being outside the diaphragm. A reddening correction is also made but it is very small.

**Table 1:** The measured lines are given in Col. 3. The last column gives the ratio of the line intensity to H $\beta$ (=100).
Ident.	$\lambda$ ( $\mu$ m)	Intensity $^\dagger$	I/H $\beta^\sharp$
?	9.98	6.52	0.96
[S IV]	10.51	1665	321
H I 9-7	11.30	4.27	0.806
[Cl IV]	11.76	4.50	0.844
H₂	12.28	3.53	0.65
H I7-6(11-8)	12.37	10.2	1.89
[Ne II]	12.81	235	43.5
[Ar V]	13.10	3.41	0.63
[Ne V]	14.31	2.78	0.51
[Cl II]	14.36	7.68	1.41
[Ne III]	15.55	2708	497
H₂	17.03	1.83	0.336
[S III]	18.70	994	184
[Cl IV]	20.31	10.47	1.07
[Ar III]	21.81	41.0	4.19
[Fe III]	22.92	3.68	0.376
[Ne V]	24.31	3.89	0.396
[O IV]	25.87	900	91.5
[Fe II]	25.98	2.51	0.255
Hi9-8	27.78	2.66	0.27
[S III]	33.46	1185	120
[Si II]	34.80	158	16.0
[Ne III]	35.99	424	42.8

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