n	$E_{n}^{e x a c t}$	$E_{n}^{F M}$ (N = 500)	$E_{n}^{F M}$ (N = 1000)	$E_{n}^{F M}$ (N = 2000)
0	−1.4112	−1.41120000000000	−1.41120000000000	−1.41120000000000
1	−1.0368	−1.03680000000000	−1.03680000000000	−1.03680000000000
2	−0.7200	−0.71999999999792	−0.71999999999994	−0.72000000000000
3	−0.4608	−0.46080000000000	−0.46080000000000	−0.46080000000000
4	−0.2592	−0.25920020140700	−0.25920002534412	−0.25920000317865
5	−0.1152	−0.11520000000000	−0.11520000000000	−0.11520000000000
6	−0.0288	−0.02711385566710	−0.02797214839035	−0.02839059824400