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Fig. 6

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a) Luminosity effects at sdO9; b) abundance effects at sdO9 – sdB0. The lines marked are HeI λλ 4121, 4144, 4387, 4471, 4713; NIII λλ 4379, 4511–15, 4640 blend; CIII λ 4650 blend; H + HeII λλ 4101, 4340, 4861; and HeII λλ 4200, 4541, 4686.

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