code: def _log10_Inorm_extern_planckint(self, Teff):
          
  
          log10_Inorm = libphoebe.wd_planckint(Teff, self.extern_wd_idx, self.wd_data["planck_table"])
  
          return log10_Inorm
docs: Internal function to compute normal passband intensities using
          the external WD machinery that employs blackbody approximation.
  
          @Teff: effective temperature in K
  
          Returns: log10(Inorm)