[R] Concentration ellipsoid

[RON70]

Hi all,

Can anyone please guide me how to draw a Concentration ellipsoid for a
bivariate system with a bivariate normal dist. having a VCV matrix : 

Sigma <- matrix(c(1,2,2,5), 2, 2)

I would like to draw in using GGPLOT. Your help will be highly appreciated.

Thanks,
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