Evolution of the spectral region around λc = 6579.7 Å for model r0e2 to illustrate the evolution of the Doppler velocity at maximum absorption as well as the peak blueshift. The value of λc corresponds to the air wavelength of the gf-weighted mean of the corresponding C II doublet. The Doppler velocity at the location of maximum absorption in this line follows closely the velocity of the photosphere shown in Fig. 6.
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