Dear Antti, No, we hadn't forgotten you :-) We've just been extraordinarily busy. May we congratulate you on a superb piece of work! We will sew this in with the stuff John has been producing (when I get a minute) and you will see it hanging from http://www.cryst.bbk.ac.uk/PPS/course/6_super_sec/index.html shortly. Many thanks for a valued contribution. I might take the liberty of adding in a few .pdb files for chemical MIME invocation of Rasmol. Or even better, if you already have them, is it being cheeky to suggest you upload them also to us, and we'll incorporate them? Thanks ever so much for a realy grand effort! Much appreciated. Best Regards, Alan Mills at Birkbeck, for vsns-pps pps@www.cryst.bbk.ac.uk PS you can see Jon's first bash at http://www.cryst.bbk.ac.uk/PPS/course/6_super_sec/super.html