Comments which code to choose for your calculation

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  • looper: models with inversion symmetry in spin space
  • sse: models with anisotropy that breaks inversion symmetry in spin space, e.g. Heisenberg models in a magnetic field

Simple Heisenberg models can be simulated with either of these. Looper has the smaller range of applicability, but if applicable, it shows the best performance (shortest autocorrelation time).