L1 sign det(-A|S) = 1.0  #eig with Re>0: 0  max Re -0.0008470089887371995
L2~ sign det(-A|S) = -1.0  #eig with Re>0: 1  max Re 0.004940170739776845
L3 sign det(-A|S) = 1.0  #eig with Re>0: 0  max Re -4.9392192645036876e-05
