a1 = {0, -1,-0.5, 0,   0.5,   1, 1.5}
b1 = {  0.2, 0.4, 0.2, 0.4, 0.6, 0.2}
G1 = ResponseFunction.New( {a1,b1,mu=0,type="ListOfPoles", name="G1"} )


a1 = {0, -1,-0.5, 0,   0.5,   1, 1.5}
b1 = {  0.1, 0.4, 0.1, 0.4, 0.3, 0.2}
G2 = ResponseFunction.New( {a1,b1,mu=0,type="ListOfPoles", name="G2"} )

G3 = G1-G2
print(G3)