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The real and imaginary parts of the input impedance are initially plotted on two separate graphs. You can merge them into a single graph by selecting the menu item '''Edit → Combine Plots''' from the "Edit Menu" of EM.Grid.You can track the data points on EM.Grid plots. In the impedance graph, click on the "Tracker" tab of the left side bar. As you move Move the mouse on the Z11 graph, you can and read the value of the horizontal axis (frequency) and the corresponding value of the real and imaginary parts of Z11-parameter in the settings panel. You can see that around 1.65GHz, the imaginary part of Z<sub>11</sub> (<i>i.e.</i> input reactance) vanishes and the antenna resonates.
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