multiplet_analysis()
Solver
green_high_frequency_moments()
sigma_high_frequency_moments()
tail_fit()
block_size_from_gf_struct()
estimate_nfft_buf_size()
orbital_occupations()
Solver.solve_parameters
Solver.constr_parameters
Violation of the fundamental Green function property G(tau)[i,j] = G(tau)*[j,i] after the measurement