docs: def F(self, **kwargs):
          '''
          Returns the Kane remote-band parameter, `F`, calculated from
          `Eg_Gamma_0`, `Delta_SO`, `Ep`, and `meff_e_Gamma_0`.
          '''
          Eg = self.Eg_Gamma_0(**kwargs)
          Delta_SO = self.Delta_SO(**kwargs)
          Ep = self.Ep(**kwargs)
          meff = self.meff_e_Gamma_0(**kwargs)
          return (1./meff-1-(Ep*(Eg+2.*Delta_SO/3.))/(Eg*(Eg+Delta_SO)))/2