I am trying to find points $(x,y)$ which satisfy the following constraint:
Where $A\simeq0.0008$. My idea was to plot $z=1000F_r(x,y)$ and $z=1$, then if I could get a 2D plot of the intersection I would have a curve $y(x)$. This is the plot I'm getting:
How can I get the 2D plot of the intersection?