Hi all I was wondering if anyone had any information on the formation and format of crystal structure files with specific reference to daresbury's xr format and the format of these files within Cerius2. Any information about the numbering of the atoms within the files relative to the image portrayed would be greatly appreciated. Cheers in advance Steve Todd mail to : S.M.Todd |-at-| chem.hull.ac.uk web-site: http://www.hull.ac.uk/php/chpsmt/