Hi, Have you seen the David Bradley paper about the SDPD Round Robin ? http://www.chemweb.com/alchem/alchem98/catalyst/ctold/ct_980911_xray_full.html Comments ? Armel Le Bail - Université du Maine, Laboratoire des Fluorures, CNRS ESA 6010, Av. O. Messiaen, 72085 Le Mans Cedex 9, France http://www.cristal.org/