[Fe/H] vs. χ_ex for our three blue spectra of CS 30317-56 (152-5, 152-4 and 151-7). For clarity, the plots for 151-7 and 152-5 have been shifted down and up by 0.8 dex, respectively. The computations were with the same OSMARCS model: T_eff =6000 K, log g = 2.0, [M/H ]  =  −2.85 dex, ξ_t = 3   km   s^-1. The mean abundance from the Fe I lines is given to the right of each plot. Abundances from Fe II are  [Fe/H]₁₅₁₋₇ =  −2.84 dex,  [Fe/H] ₁₅₂₋₄ =  −2.84 dex, and  [Fe/H] ₁₅₂₋₅ =  −2.90 dex. Accordingly, within the errors, the same model can be adopted for all spectra.