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Table 3 Maximum absolute errors for Example 2 at number of mesh points 2N

From: Accelerated fitted operator finite difference method for singularly perturbed delay differential equations with non-local boundary condition

ε N = 32 N = 64 N = 128 N = 256 N = 512
10−4 3.5556e−05 8.7577e−06 2.1733e−06 5.4134e−07 1.3509e−07
  2.0215 2.0107 2.0053 2.0026  
10−8 3.5556e−05 8.7577e−06 2.1733e−06 5.4134e−07 1.3509e−07
  2.0215 2.0107 2.0053 2.0026  
10−12 3.5556e−05 8.7577e−06 2.1733e−06 5.4134e−07 1.3509e−07
  2.0215 2.0107 2.0053 2.0026  
10−16 3.5556e−05 8.7577e−06 2.1733e−06 5.4134e−07 1.3509e−07
  2.0215 2.0107 2.0053 2.0026  
10−20 3.5556e−05 8.7577e−06 2.1733e−06 5.4134e−07 1.3509e−07
  2.0215 2.0107 2.0053 2.0026