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Fig. 1.

Fig. 1. Refer to the following caption and surrounding text.

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Temperature variations across different colours for HD 140283 (blue) and BPS CS 29502-0092 (red). The circles, squares, and diamonds represent Teff derived from the relations of (Alonso et al. 1999, Alo), (Ramírez & Meléndez 2005, R&M), and (Mucciarelli et al. 2021, Muc), respectively. The dashed lines indicate the average Teff for each star, excluding (J − K).

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