Figure 1. The calculated quasinormal frequencies ω and relative errors δω as a function of N. The calculations are carried out with rh = 1. The exact solutions are estimated by the results obtained with N = 40 interpolation points, which read ω = = = −n L1, 3 1.321 342 995 697 624 0.584 569 570 090 3002( ) i, ω = = = −n L2, 3 1.267 251 620 404 1664 0.992 016 434 193 0597( ) i.
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