Table 3: Comparison between the observed periods of PG 2131+066 (taken from Kawaler et al. 1995) and the theoretical ( $\ell = 1$ ) periods of the best-fit model ( $\overline {\delta \Pi }= 1.83$ s, $\sigma _{\delta \Pi }= 2.59$ s).
$\Pi_i^{\rm O}$ $\Pi_k^{\rm T}$ k $\delta \Pi_i$ $\delta \Pi_i/ \Pi_i$

[s] [s] [s] $[\%]$

341.45 341.40 14 0.05 0.014

- 364.21 15 - -

384.27 382.23 16 2.04 0.53

403.93 403.86 17 0.07 0.017

426.36 425.07 18 1.29 0.30

450.28 445.17 19 5.11 1.13

462.39 466.26 20 -3.87 -0.84

- 486.74 21 - -

507.91 508.27 22 -0.36 -0.07

**Table 3:** Comparison between the observed periods of PG 2131+066 (taken from Kawaler et al. 1995) and the theoretical ( $\ell = 1$ ) periods of the best-fit model ( $\overline {\delta \Pi }= 1.83$ s, $\sigma _{\delta \Pi }= 2.59$ s).
$\Pi_i^{\rm O}$	$\Pi_k^{\rm T}$	k	$\delta \Pi_i$	$\delta \Pi_i/ \Pi_i$
[s]	[s]		[s]	$[\%]$
341.45	341.40	14	0.05	0.014
-	364.21	15	-	-
384.27	382.23	16	2.04	0.53
403.93	403.86	17	0.07	0.017
426.36	425.07	18	1.29	0.30
450.28	445.17	19	5.11	1.13
462.39	466.26	20	-3.87	-0.84
-	486.74	21	-	-
507.91	508.27	22	-0.36	-0.07

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