I tried to contact you via e-mail so as not to clog this network but it was returned. I looked up your web page and found your approach very interesting but confess that I don't fully understand how to go about getting all the graphs plotted...and I could not print the graphs themselves. It is easy to plot reaction vs. time of day vs. dosage, but how do you do the superimposing of flow time data. I would appreciate your inputs. Allan