Upper panel: comparison between temperatures from photometry (Teff(Phot)) and the index of the strength of the Hδ line (Hδ); overimposed is the relation expected from theoretical models (see Munari et al. 2005). Lower panel: the same, but for temperatures from Fe lines (Teff(Fe)). Different symbols are for stars of different groups (see Sect. 4): Group 1: red filled squares; Group 2: black open squares; Group 3: blue filled triangles. The fit lines used to define TCool and THot are also plotted in the bottom panel.
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