code: def get_extended_source_fluxes(self, id, j2000_ra, j2000_dec, energies):
          
  
          return self._extended_sources.values()[id](j2000_ra, j2000_dec, energies)
docs: Get the flux of the id-th extended sources at the given position at the given energies
  
          :param id: id of the source
          :param j2000_ra: R.A. where the flux is desired
          :param j2000_dec: Dec. where the flux is desired
          :param energies: energies at which the flux is desired
          :return: flux array