Table 1: CPU timing information for assembling the BEM matrices, for solving the linear systems of equations with the Gauss solver, the LU solver, or the GMRES(50) solver with various settings of $\varepsilon$ , and for extrapolating the fields for 15 layers (CPU time in seconds).
Degrees of freedom (N) 1023 1443 1935 2499 3135 3843 4623 5475 6399 7395

Gauss 12.53 34.64 163.67 850.44 2524.63 5938.27 12 783.19 21 886.44 38 032.91 61 239.19

LU 0.86 3.66 10.34 23.22 46.44 85.94 149.66 248.36 395.78 611.64

GMRES( 50,10^-16) 2.97 6.39 12.48 22.95 37.41 59.41 88.83 137.97 191.08 271.03

GMRES( 50,10^-6) 0.89 1.86 3.50 6.06 10.08 16.06 24.41 35.44 49.54 69.69

GMRES( 50,10^-2) 0.19 0.41 0.73 1.23 1.84 2.80 4.03 5.66 7.70 10.75

Assembling 0.88 1.78 3.27 5.50 9.33 15.48 22.88 32.39 44.55 59.14

Extrapolation 15.72 31.59 56.81 95.47 151.05 227.31 330.59 478.05 644.13 863.23

**Table 1:** CPU timing information for assembling the BEM matrices, for solving the linear systems of equations with the Gauss solver, the LU solver, or the GMRES(50) solver with various settings of $\varepsilon$ , and for extrapolating the fields for 15 layers (CPU time in seconds).
Degrees of freedom (N)	1023	1443	1935	2499	3135	3843	4623	5475	6399	7395
Gauss	12.53	34.64	163.67	850.44	2524.63	5938.27	12 783.19	21 886.44	38 032.91	61 239.19
LU	0.86	3.66	10.34	23.22	46.44	85.94	149.66	248.36	395.78	611.64
GMRES( 50,10^-16)	2.97	6.39	12.48	22.95	37.41	59.41	88.83	137.97	191.08	271.03
GMRES( 50,10^-6)	0.89	1.86	3.50	6.06	10.08	16.06	24.41	35.44	49.54	69.69
GMRES( 50,10^-2)	0.19	0.41	0.73	1.23	1.84	2.80	4.03	5.66	7.70	10.75
Assembling	0.88	1.78	3.27	5.50	9.33	15.48	22.88	32.39	44.55	59.14
Extrapolation	15.72	31.59	56.81	95.47	151.05	227.31	330.59	478.05	644.13	863.23

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