Doped cerias are currently being used as oxide ion conducting electrolyte materials in solid oxide fuel cells (SOFCs). Depending on the nature and concentration of the dopant and the oxygen partial pressure (pO2), these materials can also act as mixed ionic-electronic conductors (MIECs). MIECs have a particular advantage for use in SOFCs as they allow for redox reaction over the whole surface of the electrode. This potentially allows for greater efficiency in these devices. We have recently performed a study of local structure in praseodymium doped ceria as a function of pO2 on the Polaris diffractometer. The results appear to show strong evidence of local order not evident in conventional Rietveld analysis. A short experiment is proposed to verify these results and eliminate possible sources of error to enable a publication to proceed.