On 24/05/2014 15:33, xslittlegrass wrote:
 > Hi Stephen,
 >
 > It works , thanks a lot!
 > But there is still one broken part remains. I created a zoom in of the
 > broken part here
 >
 > http://imgur.com/j1ys4Nb
 >
 > Do you know why that happens?
 >

Not really but I suspect that it may have something to do with the 
spacing of the plotted points.
Have you tried a cubic curve?
And less points. Remember that the curve does not necessary pass through 
the points. They are control points.

-- 

Regards
     Stephen

-- 

Regards
     Stephen

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