Left panels: NGC 55 spectra (black) and best fit model (red) obtained by our automatic method plus the detailed abundance analysis. The lines used in the stellar parameter and chemical abundance determination are marked in the top-left chart. Right panel: log χ2 difference between observations and the entire grid models in the Teff − log g parameter space. The χ2 difference is quantified with the color, according to the scale shown at the right of each plot. The black dashed lines mark the model with minimum χ2. Black dots represent all the grid models; the models whose parameters have been averaged to produce the stellar parameters are highlighted with white dots.
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