Hello, 

I'm displaying a picture with its level curves (isocurve). I based my code 
in Isocurves example but I have 2 additional goals:


   1. Plot at the same tiema a label each isocurve. Find an example below
   2.  To get a list with the coordinates (xi, yi) of each isocurve
   
<https://4.bp.blogspot.com/-Bn_XDTuP_MA/Vs1bFpZDLVI/AAAAAAAABw0/jXFruvBtz-w/s1600/img_03.png>


Do you have any suggestion? Thank you in advance. 

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