Tutorial on You Tube may help. http://www.youtube.com/watch?v=ecVnVpcVlm8&feature=player_detailpage
Red line is center, white line is outside of figure
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Tutorial on You Tube may help. http://www.youtube.com/watch?v=ecVnVpcVlm8&feature=player_detailpage
Red line is center, white line is outside of figure