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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! Cheers -- Ian ******************************************** Ian J. Tickle, DPhil. Director of X-ray Technology Astex Therapeutics Ltd 436 Cambridge Science Park Milton Road, Cambridge CB4 0QA, UK Tel: +44(0)1223 226214 Fax: +44(0)1223 226201 www.astex-therapeutics.com Disclaimer This communication is confidential and may contain privileged information intended solely for the named addressee(s). It may not be used or disclosed except for the purpose for which it has been sent. If you are not the intended recipient you must not review, use, disclose, copy, distribute or take any action in reliance upon it. If you have received this communication in error, please notify Astex Therapeutics Ltd by emailing [log in to unmask] and destroy all copies of the message and any attached documents. Astex Therapeutics Ltd monitors, controls and protects all its messaging traffic in compliance with its corporate email policy. The Company accepts no liability or responsibility for any onward transmission or use of emails and attachments having left the Astex Therapeutics domain. Unless expressly stated, opinions in this message are those of the individual sender and not of Astex Therapeutics Ltd. The recipient should check this email and any attachments for the presence of computer viruses. Astex Therapeutics Ltd accepts no liability for damage caused by any virus transmitted by this email. E-mail is susceptible to data corruption, interception, unauthorized amendment, and tampering, Astex Therapeutics Ltd only send and receive e-mails on the basis that the Company is not liable for any such alteration or any consequences thereof. Astex Therapeutics Ltd., Registered in England at 436 Cambridge Science Park, Cambridge CB4 0QA under number 3751674