[Ifeffit] beginner's question

Dear Subscribers, May I ask you do me a big favor to let me know when plan EXAFS experiment for comparison of local structural enviroments around certain say, Cu atoms, how to evaluate the accuracy in term of atomic spacing in angstroms for instance? secondly, if if have knowledge of European based EXAFS source, could you suggest which stations may allow the user to have sample envrioement to do in-situ measurement? best regards, Ling fei