Comment (by Liwei Ji):

Hi Roland, thanks. I will add the above test par to Carpet/test.

We are thinking about add support of mesh refinement to SphericalNR at some point. But not relatively soon. When that happens, we will update this part to make it also works with mesh refinement. Thanks for pointing it out.

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In order to get the size of boundary points, I have tried with the par granularity_boundary. It is always 0, even thought in the test par, we have set CoordBase::boundary_size_x_lower = $boundary_size. Should we set granularity_boundary explicitly in the par file or use ghost_width[i] instead for the moment?

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2601/add-four-more-parameters-for-carpet