Table 2 Values of the approximations ${\mathit{\alpha }}_{\mathit{n}}$ , defined by ( 41 ) with $\mathit{L}\mathbf{=}\mathbf{1}$ , for $\mathit{n}\mathbf{\in }\mathbf{\{}\mathbf{1}\mathbf{,}\mathbf{2}\mathbf{,}\mathbf{3}\mathbf{,}\mathbf{4}\mathbf{\}}$

${\alpha }_1(t)$

0.284

0.271

0.233

0.175

0.097

0

${\alpha }_2(t)$

0.355

0.342

0.303

0.234

0.135

0

${\alpha }_3(t)$

0.370

0.357

0.318

0.250

0.149

0

${\alpha }_4(t)$

0.371

0.358

0.319

0.249

0.144

0