eigenvalue 1000 20 10 -10.0 -1.0 -1.0 10.0 1.0 1.0 10 10 1 1 -10.0 -1.0 -1.0 10.0 1.0 1.0 10 1 1 -10.0 -1.0 -1.0 10.0 1.0 1.0 1 1 flux