Fig. 1.
Spectral region around the three (4238.19, 4262.27, and 4297.06 Å) ultraviolet Tc I lines for Tc-poor (HD 233158, blue spectrum in the top panels) and Tc-rich (V915 Aql, green spectrum in the second panels from the top) S stars from Shetye et al. (2018) and for the bitrinsic candidates o1 Ori and BD+79°156 (bottom panels). The spectra have been arbitrarily normalized and binned by a factor of 1.5 to increase the S/N.
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