JS Canvas has varying line width

For some reason, the lines in the left half of this seem thicker than the right side. Can any of you js and canvas gurus help me figure out what the problem is? What开发者_Go百科 can I do to make it so both halves of the tree have equal line widths? http://jsfiddle.net/msm595/ZxVne/18/

Thanks

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This way? http://jsfiddle.net/8E9t3/

Basically, I made the stroke() occur only at the end.