Capillaries? Sorry about my whining last night, Evo, I was having a bad night. I won't bore you guys with the details. Is there a link where I could learn how to utilize these features. If I want to mark a quote where the OP is featured, the only way I can do it is quote the whole post. But, of course, I just want to pull out the piece I'm commenting on. Also, I find myself typically reluctant to post any maths on here because I have to spell everything out, like h-bar and E=mc^2. Forget any fancy functions with quotients, etc. I obviously know it can be done because I see it here, I just don't know how to do it.