I’m using contour to plot a level set with the command:
contour(-3:0.01:3, -3:0.01:3, (x,y) -> max(abs(x-y), abs(x), abs(y)),
levels=[2.0], colorbar=false, color = cgrad([:blue,:blue]),lw=2)
and I’d like to a legend to label the figure, but I don’t quite see how to do it.