using GLMakie
f = Figure()
Axis3(f[1, 1], aspect=(0.5,0.45,1), perspectiveness=0.75)
xs = ys = LinRange(-0.5, 0.45, 100)
zs = [sqrt(x^2+y^2) for x in xs, y in ys]
contour3d!(xs, ys, +zs,levels=(.025:0.05:.45), linewidth=2, color=:gold)
contour3d!(xs, ys, -zs,levels=-(.025:0.05:.45), linewidth=2, color=:lime)
f
