how to smooth lines

After power tracing an image, the lines are rough, whats the best way to smooth the line?? 

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  •  If you used power tracing, smoothing is a delicate process; however, you can use the smoothing tool from the property bar (When Shape Tool is selected) - but, at your own peril. And 50 is usually too high. I usually set it to 20 or else the shape distorts.

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