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Fig. A.1

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Sample correction of the spectrum near lithium lines via a simulation of TiO bands. The observed spectrum (gray) was obtained with the Southern African Large Telescope (SALT) in 2020. The simulation (magenta) included TiO opacity of a cool (800 K) slab of circumstellar gas. Aside from Li I absorption components, most of the spectral features are TiO rotational lines in the P2 (Jlow=24–27) and Q2 (Jlow=36–40) branches. Weak absorption from a couple of Fe I lines may be present as well.

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