Hi all, As I understand, the EXAFS fitting procedure using Artemis, for generating a theoretical model requires the crystal structure parameter like space group, cell parameters and *specially* *atom coordinates* etc. For this we have to perform XRD measurements of single crystals of the samples. I have some questions (1) In case we dont have the XRD data of a sample then how can the EXAFS analysis be done of that sample? (2) If we have already performed the XRD on the sample then by doing EXAFS what additional information are we getting ? (3) If the answer to the first question is that - *use the crystal structure of a * * similar sample,* then what are the conditions under which we can use the known crystal structure of one sample for other samples ? Thanks in advance Abhijeet Gaur