Hi, The discussion on "Low FWHM and Rp" was recently updated, including an important recommendation to buyers. http://www.cristal.org/powdif/low_fwhm_and_rp.html#Fouryearslater This discussion started in 1994 and was already included in the Rietveld FAQs and answers : http://scsun7.unige.ch/stxnews/riet/faq/rietfaqs.htm Have a nice week end, Armel
