Question: Problem to illustrate the intersection between the ellipsoid and the plane

Hi,

I want to illustrate the intersection between The ellipsoid   "x^2/4 + y^2/9 + z^2/16 = 1"and the plane  "z = 3"

Normally, I should obtain an ellipse G1, but its graph does not match the graph obtained ? Thanks for your ideas
 

G2Exercice1.mw

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