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Fig. 3

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Spectra of He-strong C stars for which helium is dominant and carbon present. The lines marked are HeII λλ 4100, 4200, 4338, 4541, 4686, 4859; CIV λλ 4442, 4647, 4658; CIII λ 4650 blend; NIII λλ 4379, 4511–15, 4640 blend ; HeI λλ 4121, 4144, 4387, 4471, 4713; CII λλ 4267, 4619; H λλ 4340, 4861; and λλ 4326, 4510–11, 4599−4600, 4615, 4776 emission.

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