All - I've been trying to track down a paper (or papers) where it was shown that the epsilon values (symmetry factors) for space groups with pure rotation axes are not integers as is usually assumed (but still integers for screw axes). It's almost certainly in Acta Cryst., probably in the 60's or 70's and I think it was by Main and/or Woolfson and/or Rogers (but I could be completely wrong about that part), and it might just be in an Appendix. I tried the obvious searches on the IUCr website with no luck (I was rather surprised to find that searching for 'symmetry' or 'space group' by 'Main' and/or 'Woolfson' yielded no hits - I find that very hard to believe!). If anyone knows the reference I'd be eternally grateful!
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