Fig. A.3
High-resolution optical spectra of the non-Tc AGB star R Cen (in black; this paper) and the Tc AGB star S Her (in red; taken from Uttenthaler et al. 2011) around the Tc I line at 4238 Å. The wavelength of the Tc line is marked with a dashed vertical line. We note that S Her displays a strong Tc I line that is completely absent in R Cen.
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