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Fig. 2

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Equivalent width (positive for absorption) of N ivλ4058 (black) and N ivλ6380 (red) as a function of Teff. Solid and dotted curves refer to low (model series “A”) with log g = 4.0 and 3.7, respectively, and dashed curves to supergiant mass-loss rates (model series “E”), with log g = 4.0.

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