If you can't get your graphing tool to do the shading, just add some clip art of cosmologists discussing the unusual curvature of space in the area.

"Pie Charts", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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If you can't get your graphing tool to do the shading, just add some clip art of cosmologists discussing the unusual curvature of space in the area.