eigenvalue = -8	mult 1
eigenvalue = -4	mult 6
eigenvalue = -3.8637	mult 12
eigenvalue = -2	mult 8
eigenvalue = -1.03528	mult 12
eigenvalue = 0	mult 18
eigenvalue = 1.03528	mult 12
eigenvalue = 2	mult 8
eigenvalue = 3.8637	mult 12
eigenvalue = 4	mult 6
eigenvalue = 8	mult 1