**Table 2:** Comparison between numerical and theoretical first order eigenvalues ( $\varepsilon ^{1/2} \lambda ^1$ ). The two sets of numerical values (Cols. 2 and 3) are based on the numerical eigenspectrum given in Fig. 1 and are calculated using a least square method. These values should be very close to each other. The last column is based on Eq. (33).
n	$\mbox{Num.}(\varepsilon^{1/2} \tau^1)$	$\mbox{Num.}(\varepsilon^{1/2} \omega^1)$	$\mbox{Theo.}$
0	-0.0690	-0.0685	-0.0688
1	-0.1224	-0.1237	-0.1239
2	-0.1601	-0.1608	-0.1608
3	-0.1907	-0.1910	-0.1910
4	-0.2171	-0.2173	-0.2172
5	-0.2406	-0.2406	-0.2407
6	-0.2621	-0.2624	-0.2621
7	-0.2822	-0.2819	-0.2820

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