T _eff deviations with respect to resolution and [Fe/H] ordered from the strongest to the weakest relation (see Table A.1 and Fig. 5) from top left to bottom right. The deviations were computed by scaling ΔFR with the slope of the respective relation. Points measured for the same star but at different Rs are connected by solid lines. The color coding is the same T _eff scale as in Fig. 7.