Top: SED of the model chromosphere of the G2 star α Cen A, based on the modified solar C 7 model, is shown with the blue curve. Data are from Spitzer, Herschel, and APEX (Liseau et al. 2013) (small blue symbols and dotted error bars) and from ALMA (big blue squares). The ALMA bands are indicated at the bottom of the figure and the stellar photosphere is shown as RJ(T_eff). For comparison, data for the quiet Sun from Loukitcheva et al. (2004) are shown as black open circles. Middle: run of T_B with height h with symbols as above. For comparison, also the corresponding model for the K 1 star α Cen B is shown in red, and, for reference, the solar C 7 model as black dots. Bottom: run of density n(H) and turbulent velocity υ_turb with height h is shown for the solar analog α Cen A.