Fig. B.1
Non-variable ARGUS sources displaying composite spectra. Emission lines labelled are N iv λ4058 and Si iv λλ4089, 4116. Absorption lines labelled are He i λ4026, He i λ4143, He ii λ4200, He i λ4388, He i λ4471, He ii λ4542 and a diffuse interstellar band at 4428 Å.
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