For the O-2p PDOS the discussed variations mainly occur at low oxygen ratios (0.25 to 0.6) but vary less at higher ratios. In contrast, the change in Pt-5d PDOS is more gradual, suggesting that the Pt structure continuously accommodate to additional oxide species. This suggests that the oxide species are in fixed electronic states for higher oxygen ratios, which can be used to explain the trends observed in Figure which showed an initial important destabilization with oxygen ratio, and a progressive saturation regime observed at higher oxygen ratios.