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Fig. C.1.
Spectral region around the three (4238.19, 4262.27 and 4297.06 Å) violet Tc I lines in the sample S stars as well as in a Tc-poor S star from S18 (HD 233158, red curve in the top panels) for the sake of comparison. The spectra have been arbitrarily normalized and binned by a factor of 1.5 to increase the S/N.
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