[Ifeffit] SO2 parameter for Cu2O

Hi all, I am fitting Cu2O EXAFS data taken at SSRL using the Artemis. But there is a problem with fitting results that SO2 parameter is coming very low around 0.50. I had also taken Cu2O data from different data bases to check whether theere some problem with my data, but after fitting them, the same problem of low SO2 is coming. In some research papers given SO2 parameter for Cu2O equal to 0.82. But I am unable to get that why all the Cu2O data giving low value of SO2. Is there any other fitting procedure to fit the compounds like Cu2O ?????? With thanks Abhijeet Gaur