File:Force Variation Waveform.JPG
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Licensing:
{{PD-self|date=May 2008}}
{{Copy to Wikimedia Commons|bot=Fbot|priority=true|date=March 2012}}
{{Bad JPEG}}
{{PD-self|date=May 2008}}
{{Copy to Wikimedia Commons|bot=Fbot|priority=true|date=March 2012}}