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Selected optical spectral lines

A small (but growing) list of selected (read handy!) optical lines: element wavelength(Å) [NeV] 3346 [NeV] 3426 [OII] 3727 [NeIII] 3869 [NeIII] 3967 Hε 3970 [SII] 4072 Hδ 4101 Ca I 4226 Hγ 4340 [OIII] 4363 HeI 4471 HeII 4686 Hβ 4861 [OIII] 4959 [OIII] 5007 [NI] 5199 [FeVII] 5721 [NII] 5755 HeI 5876 [FeVII] […]