[ccp4bb]: Difference between Rsym and Rmerge?

[Phil Evans <pre@mrc-lmb.cam.ac.uk>]

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Paula Lario writes:
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 > 
 > Hi All,
 > 
 > I was hoping I could get some clarification on the difference between
 > Rsym and Rmerge.
 > 
 > Does the Rsym represent the differences in the symmetry related
 > reflections on a single image?
 > 
 > or,
 > 
 > Does it represent the differences in the symmetry related reflections on
 > a single crystal?
 > 
 > If it is the later, what about low and high resolution data collections?
 > 
 > Do you report an Rmerge because you are comparing 2 different data sets?
 > 

As far as I know, the terms Rsym & Rmerge are interchangeable

   Phil