Dear All,
I am trying to reproduce the top left figure 5 with $q = 0$ from the manuscript https://arxiv.org/pdf/1707.09521 . In this case, for $\theta = \pi/2$ in equation 52, $\alpha$ is equal to equation 45 in negative. Furthermore, I replace equation 44 to obtain $\beta$ in equation 52. However, I am not getting the figure. I am attaching my worksheet.
Perhaps the goal would be to plot equation 55, but I can't figure out how to plot the contour of an equation of the type $\alpha(x)^2 + \beta(x)^2 = f(x)$ with $\alpha$ and $\beta$ on the horizontal and vertical axes.
Any help would be appreciated.
Best regards.
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