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While electroplating in the 0-degree tilt position, air bubbles were caught in the system and were not able to escape.
 
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While electroplating in the 0-degree tilt position, air bubbles were caught in the system and were not able to escape.
While electroplating in the 0-degree tilt position, air bubbles were caught in the system and were not able to escape. Consequently some areas on the wafer were not deposited with copper.