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Description
HiPACE++ can read a beam from file, but currently spin data in this file would be ignored. The reader should be fixed to support this. This input file can be used to run a short simulation with spin, stop, and restart to check whether the spin data is properly transported. The spin evolution can then be compared between 2 simulations (5 + 5 time steps) and 1 simulation (10 time steps). PR #1172 started to look into this but is not completed.