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Fig. A.1

image

Ionization fractions of C iv (at v(r) = 0.5v), as a function of Teff, and for different X-ray emission parameters. Solid: supergiant models; dashed: dwarf models; black: models with shock emission; magenta: models without shock emission. For clarity, the ionization fractions of dwarf models have been shifted by one dex.

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