How to get figure 2

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Hi authors: I have read this excellent paper recently. Thank you so much for your paper. It really helped me to understand the differences between W space and Wk space. I want to know how to get a 2D visualization example of W and Wk space like figure 2. Could you kindly help me resolve this question in your spare time?

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I am also curious about this. Please kindly let my know if you figure out how. Thank you in advance.