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README.md

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+This application allows you to plot a chart showing the relationship between amplitude and frequency, detecting nearby signal sources. If there is a nearby source broadcasting a signal at the observed frequency, the graph will go up sharply.
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+The app has the following controls:
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+- The OK button adjusts the width of the spectrum.
+- The Up and Down buttons zoom in and out.
+- The Left and Right buttons switch between different frequency bands.