Quick thought.. I noticed that the x axis on the graph is very narrow, 1.5, 2.9, 4.4, and 5.8 as the pressure delta. Wouldn't we be better off changing the x axis to be something like 5, 10, 15, 20? I mean I want high P values at high pressure differentials, but a lower P value at low pressure differentials somewhat how the stock tables do it. Maybe a better questions would be, what happens when we change the X values of the tables..