Panel a shows the Rietveld refinement of ambient temperature Time-of-Flight neutron powder diffraction data from a medium-resolution detector bank centred around 2θ = 63.6◦. Data (red points), calculated pattern (black line), Bragg positions (green markers) and difference pattern (blue line) are shown. Panel b displays the experimental Pair Distribution Function (PDF) of Ce2Sn2O7 (blue open circles) obtained from all detector banks and after usual corrections and background subtraction (see Supplementary Information). The red line is a fit of the PDF using a perfect pyrochlore structure, and the green line shows the difference between the experiment and this calculation. The PDF provides a powerful tool to further check and confirm the structure of the sample. In particular, it is highly sensitive to the environment around Ce3+, and the analysis fails to provide evidence for any significant deviations of local structure relative to that in a perfect pyrochlore structure.