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<http://d2n4wb9orp1vta.cloudfront.net/resources/images/125/cdn/cms/PF_0312_ENERGY_Plating_ForcingVoltage_Fig1.jpg>
<http://www.pfonline.com/articles/ripple-effect-researchers-say-leveling-of-electrodeposits-can-be-achieved-by-applying-a-small-forcing-voltage>