Alexander-txj

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Can you add contour map

like this ![image](https://user-images.githubusercontent.com/25924952/103340262-9640c180-4abe-11eb-8690-6678ad120659.png) ![image](https://user-images.githubusercontent.com/25924952/103340301-ae184580-4abe-11eb-99f6-5b3a6558e2f8.png) ![image](https://user-images.githubusercontent.com/25924952/103340328-ba9c9e00-4abe-11eb-87dc-00a96464b35d.png) The last is the polar coordinate contour map that I realized with d3 ![image](https://user-images.githubusercontent.com/25924952/103340442-08190b00-4abf-11eb-8889-20d9e86dc445.png)