Select the data files “Sensor_1_X_ETotal.DAT” and "Sensor_1_X_EPotential.DAT" by highlighting them in the data manager's list. Note that you can make multiple selections using your keyboard's {{key|Ctrl}} or {{key|Shift}} keys.
Click the {{key|Plot}} button to open "EM.Grid", [[EM.Cube]]'s graphing utility. The total E-field and the electric potential are plotted as functions of the coordinate X on two Cartesian graphs in EM.Grid as shown in the figures below. The EM.Grid graphs are interactive. If you move the mouse around the graph, you can read the values of the graph on EM.Grid's Status Bar. You can also track the data on the plots. Click the '''Track Selected Plot''' [[file:Grid track icon.png]] button of EM.Grid's top toolbar. In this mode, a pair of crosshair lines appear appears on the graph that trace the data points on the selected plot. The horizontal and vertical axis values of each data point are displayed in the status bar.
From the figure below, you can see that the electric field increases linearly from r = 0 to r = 5mm, where it reaches a value of 1.89V/m as read by the tracking crosshairs. This is very close to the value we calculated earlier. The electric field then quickly drops down as 1/r<sup>2</sup> in the free space.