code: def flux(self, photon_energy, distance=1 * u.kpc, seed=None):
          
          model = super(InverseCompton, self).flux(
              photon_energy, distance=distance
          )
  
          if seed is not None:
              # Test seed argument
              if not isinstance(seed, int):
                  if seed not in self.seed_photon_fields:
                      raise ValueError(
                          "Provided seed photon field name is not in"
                          " the definition of the InverseCompton instance"
                      )
                  else:
                      seed = list(self.seed_photon_fields.keys()).index(seed)
              elif seed > len(self.seed_photon_fields):
                  raise ValueError(
                      "Provided seed photon field number is larger"
                      " than the number of seed photon fields defined in the"
                      " InverseCompton instance"
                  )
  
              if distance != 0:
                  distance = validate_scalar(
                      "distance", distance, physical_type="length"
                  )
                  dfac = 4 * np.pi * distance.to("cm") ** 2
                  out_unit = "1/(s cm2 eV)"
              else:
                  dfac = 1
                  out_unit = "1/(s eV)"
  
              model = (self.specic[seed] / dfac).to(out_unit)
  
          return model
docs: Differential flux at a given distance from the source from a single
          seed photon field
  
          Parameters
          ----------
          photon_energy : :class:`~astropy.units.Quantity` float or array
              Photon energy array.
  
          distance : :class:`~astropy.units.Quantity` float, optional
              Distance to the source. If set to 0, the intrinsic luminosity will
              be returned. Default is 1 kpc.
  
          seed : int, str or None
              Number or name of seed photon field for which the IC contribution
              is required. If set to None it will return the sum of all
              contributions (default).