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Summary

This image was created in Mathematica. The hole you can see in the center is because that region is within the Schwarzschild radius, so the given transformation for embedding into Euclidean space gives nonreal results there.

 

This diagram was created with Mathematica.

Licensing

I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.