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In some instances the wave will be asymetrical. There will be no difference at the zero line. What I see very often is a track with many more positive peaks than negative. There was a Gates limiter that was used at many AM stations years ago that would cheek the waveform & invert it to make it positvie. On an XZ scope. this positve wave will be higher on the top. Using the micro-edit waveform it is very easy to see an inverted signal. I can send some examples if you like...
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