Line style for parts of an ellipse
I am currently trying to reproduce a figure that is presented in this paper. I created a sphere as a 3d figure and projected it onto a 2d plane (see attachment). Now I want to change the line style of the "invisible" part of the 2d projection to make it look similar to the 3d case. The paper tells me to use the intersection tool but I have no idea how that helps me to proceed. Any help is greatly appreciated.