Kay,

I beg to differ, but only in a pedantic way. Historically, Rsym would refer to the agreement in symmetry-related reflections within a single data set and Rmerge would be the agreement between 2 or more data sets that were merged. This was the way we did it back in the "old day" of precession photography and early oscillation photography. While the terms seem synonymous today, the recent thread "[ccp4bb] combine incomplete data sets" illustrates where such a distinction is still relevant, where the "merging" is between data collected under different experimental conditions (i.e., a different crystal in a different orientation).

Michael

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On Jan 18, 2008, at 10:15 AM, Kay Diederichs wrote:

Salameh, Mohd A., Ph.D. schrieb:
Hi everybody!
I will appreciate it if anybody can clarify to me the differences between Rmerge and Rsym. Many thanks, M

there is no difference - unfortunately there are two words for the same thing. "Rmerge" currently appears to be more in fashion.

just my 2 cents,

Kay
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Kay Diederichs                http://strucbio.biologie.uni-konstanz.de
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