Top panel: (left) dependence of metallicity with temperature for several values of microturbulence, (right) dependence of the coefficients a and b with ξt, so that [Fe/H] = a ⋅ T + b. Bottom panel: coefficients of the fit of [Fe/H] with T and ξt, so that a = m0 ⋅ ξt + m1 and b = m2 ⋅ ξt + m3. A vertical offset was applied to each coefficient for plotting purposes.
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