Dependence of the h₁ (left panels) and (right panels, see text for the definition) coefficients on metallicity (top panels) and effective temperature (bottom panels). Dashed lines indicate the solar value of the metallicity (M/H = 0, top panels) and the effective temperature of 5800 K (bottom panels). The h₁ and values are shown, obtained from the actual intensity profiles (red curves) and the power-2 law fit (blue curves).