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Smith chart
The Smith chart maps every normalized impedance z = r + jx inside a circle. Circles of constant resistance (r) all touch at the right edge, and arcs of constant reactance (x) curve up for inductive and down for capacitive values. This chart draws r and x from 0.1 to 20, with bolder, labeled lines at 0.2, 0.5, 1, 2 and 5.
Use it to read reflection coefficients, design matching networks or follow a load along a transmission line. The chart is drawn as the largest circle that fits inside your margins.