Before revision: Mathematically, they are given by where is a fitting parameter related to the strength of the Lorentzian oscillator, is a fitting parameter related to the broadening of the Lorentzian oscillator, is a fitting parameter related to the resonant frequency of the Lorentzian oscillator, is a fitting parameter related the bandgap of the material.
After revision: toMathematically, they are given by where is a fitting parameter related to the strength of the Lorentzian oscillator, is a fitting parameter related to the broadening of the Lorentzian oscillator, is a fitting parameter related to the resonant frequency of the Lorentzian oscillator, is a fitting parameter related the bandgap of the material.