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+xnec2c is a GTK+ graphical interactive version of nec2c. It
+incorporates the nec2c core which it uses for reading input files
+and calculating output data, but it does not need and indeed does
+not produce an output file by default. Since xnec2c incorporates
+the nec2c core, it has access to all internal buffers, including
+structure data, frequency-related data (structure currents, input
+impedance, gain etc) and radiation pattern data (for the far field
+and near field). It therefore has the ability to graphically display
+user-requested data directly, as the frequency loop progresses or
+after input from the user. Graphs of frequency-related data and
+the current or charge distribution evolve as the frequency loop
+progresses, and radiation patterns (far and near field) are
+sequentially drawn for each frequency step. A new frequency can be
+entered by the user from spin buttons in the main or radiation
+pattern windows or by clicking on the graphs of frequency-related
+data. New output data are then computed and displayed in text and
+graphical form.