T_eff values from the literature estimates versus the values obtained in this work. Upper panel: differences between the temperatures given in the literature and the values derived in this work. Median uncertainties in the derived temperatures are also shown. The symbol ⟨⟩ in the legend represents the median difference. The black continuous line represents the 1:1 relation, whilst the grey dashed line represents the best linear fit between our estimates and those obtained using the relationship of CA08 (see text in Sect. 4.1).