Table 2: ISO LWS spectrum of M 1-42. The measured lines are given in Col. 3. The last column gives the ratio of the line intensity to H$\beta $(=100). The intensities are measured in units of 10-14 erg cm-2 s-1. No reddening correction has been made.
Ident. $\lambda $($\mu $m) Intensity I/H$\beta $
[O III] 51.83 3830 383
[N III] 57.32 2690 269
[O I] 63.19 318 31.8
[O III] 88.35 1800 180
[N II] 121.9 59 5.9


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