From: An accurate Chebyshev pseudospectral scheme for multi-dimensional parabolic problems with time delays
N  =  M
4
6
8
\(M^{3}_{E}\)
1.55 × 10−3
3.22 × 10−6
3.89 × 10−9
\(M^{4}_{E}\)
6.86 × 10−5
1.41 × 10−7
9.47 × 10−10