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Hi Mohammed, you've put the finger on a weak point in reporting crystallographic statistics ;-). The use of Rmerge and Rsym differs wi(l)dely amongst crystallographers. In my opinion, Rsym should be reported for the single crystal internal symmetry R-factor between symmetry-equivalent reflections, whereas Rmerge should be used as the cross-data-set merging R-factor if several data sets are merged together. However, often, you will find Rmerge in place of Rsym in single-crystal statistics tables ... Best regards, Dirk. Am 18.01.2008 um 16:02 schrieb Salameh, Mohd A., Ph.D.: > Hi everybody! > > I will appreciate it if anybody can clarify to me the differences > between Rmerge and Rsym. Many thanks, M > > **************************************************** > > Mohammed A. Salameh, Ph.D. > > Mayo Clinic Cancer Center > > Griffin Cancer Research Building > > 4500 San Pablo Road > > Jacksonville, FL 32224 > > Tel:(904) 953-0046 > > Fax:(904) 953-0277 > > [log in to unmask] > > **************************************************** > > > ******************************************************* Dirk Kostrewa Gene Center, A 5.07 Ludwig-Maximilians-University Feodor-Lynen-Str. 25 81377 Munich Germany Phone: +49-89-2180-76845 Fax: +49-89-2180-76999 E-mail: [log in to unmask] *******************************************************