Fig. 11.
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Top panels: Comparison of the normalised mean (left panel) and rms (right panel) line shapes of the Balmer emission lines with the He Iλ5876 emission line. Bottom panels: Comparison of the normalised mean (left panel) and rms (right panel) line shapes of the He Iλ5876 emission line with the He IIλ4686 emission line. We note that the blue wing of the mean He IIλ4686 profile blends with emission from N IIIλ4640, C IVλ4658, and Fe II (37, 38) multiplets.
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