Notes

1As ECAO is a dimer in the asymmetric unit some xenon sites are observed in equivalent positions in both monomers, while others are observed in only one of the subunits. In the following discussion of individual xenon sites, those observed in both monomers are identified as `xenon A/B', where A is the xenon number in monomer A and B that in monomer B. When a xenon is observed in only a single subunit, this is indicated as either `xenon A/-' or `xenon -/B'.