Fig. 7. The predicted difference in effective temperature determinations from our new calculations, and calculations using the resonance broadening theory of Ali & Griem (1966) for H, H and H. Plots are shown for solar metallicity (top), 1/10 solar metallicity (middle) and 1/100 solar metallicity (bottom), in both cases for solar surface gravity. The "reference temperature" is that which would be found using our broadening theory. The plot then predicts how much higher the effective temperature derived using the Ali & Griem (1966) theory is expected to be.