[ALPS-users] multiple eigenvalues (degenerate eigenstates) in sparsediag

For a system with multiple eigenvalues (e.g. ground state of the extended Hubbard model on a closed chain of 4 sites with 4 electrons, zero spin, and U=2V) sparsediag program returns only one eigenstate for each multiplet. How other eigenstates can be obtained if there is no quantum number differentiating them? Thanks, Andriy