First row: calibration for the Ca II H and K doublet (left panel), He I D₃ and also Na I D₁, D₂ (middle panel), and Ca II IRT lines (right panel). Second row: the curves for Paδ (left panel), Paγ + He I λ10830 (middle panel) and Paβ (right panel). All are in the range of effective temperatures [2200, 7000] K. The calibration curve for Hα can be seen in Figure 4.