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HubbardEntanglementEntropyParticlePartition computes the particle entanglement spectrum for Hubbard models. Its usage is almost identical to the one of FTIEntanglementEntropyParticlePartition. Eigenstates of the reduced density matrix can be exported using the --density-eigenstate . By default, all eigenstates corresponding to an eigenvalue greater than <math>10^{-14}</math> are exported. This behaviour can be changed by setting the option --nbr-eigenstates to the required number of eigenstates.