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Spectroscopic Atlas for Amateur Astronomers 159
TABLE 81 [Ar III] 7135.8
He I 7065.2
[N ll] 6583.6 [S II] 6717 / 31
Hα 6562.82 He I 6678.1
[N ll] 6548.1
[O I] 6300.2
Excitation Class E1 He I 5876
[N ll] 5754.8
Spirograph Nebula IC 418 [O lll] 5006.84
Criterion IN1+N2 /Hβ ≈ 2.8 Classification lines [O lll] 4958.91
Hβ 4861.33
He I 4471.5
Hγ 4340.47
Hδ 4101.74
