I'm trying to replicate the isovariance curves from Markowitz (1952).
The equation which forms these curves is given by the Footnote no. 8.
Markowitz claims that they take an ellipsoidal form as shown in the picture below:
![enter image description here](/c/portal/getImageAttachment?filename=Figure2.jpg&userId=61922)
However I don't manage to make them look as such.
Anyone willing to have a look?
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