High-resolution (R ~ 38 000) UVES spectrum of KN Cen ([Fe/H] = 0.55 ± 0.12, Genovali et al. 2013) and TV CMa ([Fe/H] = 0.01 ± 0.07, Genovali et al. 2013). The apparent visual magnitude and the S/N in the spectral range λ ~ 5650–7500 Å (red arm) are also labeled. The vertical dashed lines display selected lines (Fe I 6078.50, Fe I 6082.72, Fe I 6085.27, V I 6090.21, Si I 6091.92 Å) adopted to estimate the individual Teff with the LDR method (Kovtyukh & Gorlova 2000) (red dashed lines).
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