Approximation of u 2,1 (x, 0) by a finite sum of Chebyshev polynomials (400 terms) for γ = 0.05 and far-field loading σ = 0.01, 0.02, 0.04. 47 3.3 Approximation of u 2,1 (x, 0) by a finite sum of Chebyshev polynomials (400 terms) for far-field loading σ 0 = 0.02 andγ = 0.