Fig. 1
Temperature of the continuum atmospheric model layer where τλ = 1 for wavelengths between 20 and 200 μm (black thick symbols) for α Boo. The temperature of the characteristic layer where most of the photospheric flux is formed (Tτλ = 1) for the full 200 to 7500 μm wavelength range is derived by extrapolation from the 50 to 200 μm wavelength range (grey line).
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