“…1, 1 + 1/20] × [1, 1 + 1/20] (r = 2,3,4,5,6,7,8,9,10) and then constructing Halton points (with generating primes 3 and 7) on the same square. Then, the interpolant has been evaluated at 169 points taking nodes with coefficients (α, β) on a regular 13 × 13 grid over [1, 1 + 1/20] × [1, 1 + 1/20].…”