A high‐resolution spectroscopic survey in the 6380–6460 Å region of 224 slowly‐rotating M‐K class III giants is presented. Spectral line‐depth ratios are calibrated against effective temperature obtained from B – V and V – I color indices in the range 3200–7500 K (M6–A9). A table of polynomial coefficients for 12 line‐ratio–Teff relations can be used to derive Teff of F–M stars to within 33 K (rms), and of early‐F and mid‐to‐late M stars to within 77–106 K (rms).
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