Table 3 \(a=0\), the four eigenvalues with \(l=2\) and h

h	\(\lambda _{2h}^{1}\)	\(\lambda _{2h}^{2}\)	\(\lambda _{2h}^{3}\)	\(\lambda _{2h}^{4}\)
1/64	33.221527912004	82.779965293070	152.120849702143	241.466504738343
1/128	33.218478774072	82.734418406613	151.921374315241	240.893774149263
1/256	33.217716151749	82.723028162111	151.871499583334	240.750621394948
1/512	33.217525475045	82.720180381294	151.859030542575	240.714835156415
1/1024	33.217477804567	82.719468422366	151.855913260174	240.705888719943