Dear All,

I have a very common question, which is already asked many times: the S02 value is larger than 1.

I measure the Sr K-edge EXAFS of SrTiO3 with temperature dependence.

The S02 value is larger than 1.

I check the book of “XAFS for everyone”, in which say maybe because of the distorted data or wrong structure model.

I check the data measured by other beamline with the same sample, the S02 value still is larger than 1.

I change the background reduction parameters, same result.

I also modify the model, still same result.

I am very confused with these results.

I attached the data, FEFF paths, and the fitting python Code the package.

Can anyone help me check my fitting procedure.

Best regards,

Fan