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A new summation method model of the reactor antineutrino energy spectrum ispresented. It is updated with the most recent evaluated decay databases andwith our Total Absorption Gamma-ray Spectroscopy measurements performed duringthe last decade. For the first time the spectral measurements from the Daya Bayexperiment are compared with the detected antineutrino energy spectrum computedwith the updated summation method without any renormalisation. The resultsexhibit a better agreement than is obtained with the Huber-Mueller model in the2 to 5 MeV range, the region which dominates the detected flux. An unexpectedsystematic trend is found that the detected antineutrino flux computed with thesummation model decreases with the inclusion of more Pandemonium free data. Thedetected flux obtained now lies only 1.9% above that detected in the Daya Bayexperiment, a value that may be reduced with forthcoming new Pandemonium freedata leaving less and less room to the reactor anomaly. Eventually, the newpredictions of individual antineutrino spectra for the $^{235}$U, $^{239}$Pu,$^{241}$Pu and $^{238}$U are used to compute the dependence of the reactorantineutrino spectral shape on the fission fractions.

Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes