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Fig. 2
A sample of G–K low-luminosity supergiants observed with AF2. Note the evolution of the Ti i 8683 Å/Fe i 8679 Å ratio with spectral type. All these objects have relatively low extinction. In most of them (but not in J18392955−0544222) the 8620 Å DIB, blended with Fe i 8621 Å, is hardly noticeable.
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