ersion factor between radians and output units
 direction .. If P is 5D, which direction to use
              If P is 4D, must equal 1
 showplots .. Boolean; whether or not to open a figure with motion plots

 Outputs:
 amplitude .. Peak-to-peak wave amplitude (in radians) * scale</p>

<h3>References</h3>
    <h4>Calls</h4>
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      </ul>
    <h4>Called by</h4>
      <ul>
        
      </ul>
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