code: def emflx(self, area, wavelengths=None):
          
          t_lambda = self.tlambda(wavelengths=wavelengths)
  
          if t_lambda == 0:  # pragma: no cover
              em_flux = 0.0 * units.FLAM
          else:
              uresp = self.unit_response(area, wavelengths=wavelengths)
              equvw = self.equivwidth(wavelengths=wavelengths).value
              em_flux = uresp * equvw / t_lambda
  
          return em_flux
docs: Calculate
          :ref:`equivalent monochromatic flux <synphot-formula-emflx>`.
  
          Parameters
          ----------
          area, wavelengths
              See :func:`unit_response`.
  
          Returns
          -------
          em_flux : `~astropy.units.quantity.Quantity`
              Equivalent monochromatic flux.