Fig. E.3
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Spectra of two C-rich supergiants compared to standards of the same spectral types. The most obvious effect is the weakening of all N II lines, the strongest of which are marked on top of the spectrum of HD 13841. In addition, C II 4267 Å is enhanced in the spectrum of HD 14443. In κ Cas, there are also enhanced contributions of C III to the O II complex around 4072 Å, and the 4650 Å blend.
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