code: def flux(self) -> ErrorValue:
          
          try:
              return ErrorValue(self._data['Flux'], self._data.setdefault('FluxError',0.0))
          except KeyError:
              return 1 / self.pixelsizex / self.pixelsizey / ErrorValue(self._data['NormFactor'],
                                                                        self._data.setdefault('NormFactorError',0.0))
docs: X-ray flux in photons/sec.