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double or single precision MPAS for the grids ?


I have started the tutorial for MPAS here MPAS Tutorial — Practice Session Guide
In this tutorial, the code is compiled in single precision. The meshes are from the tutorial directory and used as they are for the initialization of MPAS. On the other hand, I have read that the meshes are in double precision, and shall be converted in single precision meshes when used with a MPAS code compiled in single precision. I don't see such conversion in the tutorial. So I am a little bit confused.
Are the meshes from the tutorial already converted in single precision ?
If I download another pre-calculated mesh from here, shall I convert it in single precision ?
Thank you