Comment (by Roland Haas):

Please add a description of the new coordinate system to Llama’s arrangement docs: https://bitbucket.org/llamacode/llama/src/master/doc/documentation.tex visible on the web http://einsteintoolkit.org/arrangementguide/Llama/documentation.html

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2447/llama-coordinates-add-cartesian-planar-2d