Pam, Didn't receive your email address (my reader's different than most others) so I have to respond here to the list. About 6 or 7 of us Ziegler researchers suddenly discovered we had an "informal" group going, and I have suggested that everyone subscribe to this list to relay our info back and forth. We are all working on the same lines, but we need to share with all the other via this list. Haven't gotten any replies yet from the others, but maybe the traffic will pick up a bit. RGDS:EARL in Louisville earl_cook@pvn.com ecook@ntr.net