Fig. 1

The numerical solution profile: (a) for \(N=M=64, \varepsilon _{1}=10^{-2},\varepsilon _{2}=10^{-8}\) and (b) for \(N=M=128, \varepsilon _{1}=10^{-12},\varepsilon _{2}=10^{-6}\) for Example(1)
The numerical solution profile: (a) for \(N=M=64, \varepsilon _{1}=10^{-2},\varepsilon _{2}=10^{-8}\) and (b) for \(N=M=128, \varepsilon _{1}=10^{-12},\varepsilon _{2}=10^{-6}\) for Example(1)