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A trace that is internal to the board and references two ground planes and is closer to one ground plane.

Critical Variables   Examples 50 Ohms 70 Ohms   User Input Dielectric Constant   Height (H) " "   " Height (H1) " "   " Trace Width (W) " "   " Thickness (T) " "   " Impedance (Ohms)   Variance (+/- Ohms)     Trace Width Sensitivity -0.001 -0.0005 Target 0.0005 0.001 1 Mil Variance = Ohms Height #1 Spacing Sensitivity -0.001 -0.0005 Target 0.0005 0.001 1 Mil Variance = Ohms Height #2 Sensitivity -0.4 -0.2 Target 0.2 0.4 .1 Mil Variance = Ohms Dielectric Constant Sensitivity -0.001 -0.0005 Target 0.0005 0.001 1 Mil Variance = Ohms