X-shooter spectrum of the Ca I (bottom) and Ca II (H & K: middle and top, respectively) lines and best-fitting models at (log g = 8) T_eff = 5400 K and log n(Ca)/n(H) =  −10.3 (thick lines), and T_eff = 4900 K and log n(Ca)/n(H) =  −10.45 (thin lines). The wavelength scale is normalized to Δλ₁ ≡ 4.67 × 10^-7λ²B, where B = 0.513 MG. Therefore, the line positions match the factors g_lm_l − g_um_u listed in Table 4 (vertical dashed lines). All models assume ψ = 60°.