Creating slope on Decline Curve for boundary dominated flow

I have created a log-log plot displaying (1/Q) vs. (Np/Q) and wish to display a line with a slope of one on the same plot, in order to determine when Boundary dominated flow begins. Attached is a picture of my plot. I am new to spotfire and when I attempt to custom draw a curve, I am unable to input the correct function description. (BDF occurs at slopes >=1)





Image icon capture.png_tibcoforum.png80.83 KB

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