Sender: madura@moe.chem.usouthal.edu (Jeffry D. Madura) Subject: Re: WSN: ice coordinates Dear Marv, The information you need is as follows: O (0.3333, 0.6667, 0.0629) Ha(0.3333,0.6667,0.1989) Hb(0.4551,0.9102,0.0182) a=b=4.516 angstroms c=7.354 angstroms alpha=beta=90 degrees gamma=120.0 degrees space group for Ih is No. 194 P63/mmc If you need this in Cambridge format I can send upon your request. Regards, jeffry