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Fig. 1

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Temperature structure from the WC star model by Gräfener & Hamann (2005). TNLTE (black) is the temperature computed in non-LTE within the model, and TLucy (red) is obtained from the relation by Lucy & Abbott (1993) which is identical with Eq. (17) for . Tflux (blue dashed) denotes the local flux temperature. The dashed vertical lines indicate the classical photosphere rph with a flux-mean optical depth τ = 2/3, and the electron-scattering photosphere res with an electron-scattering optical depth τes = 2/3. Solid vertical lines indicate the sonic radius Rs and the reference radius Rref with where TLucy = Tflux is adopted (cf. Eq. (13)).

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