Due to the fact that the authors initially focused on the readership, for which not only the theory of interpolation methods itself is of interest, a detailed description of which can be found in numerous textbooks on computational mathematics and numerical methods, but also the ability to apply these methods to solve practical problems, the book for each of the methods under consideration presents listings of their software implementations in the MATLAB package, examples illustrating the technologies of their use are given, and a detailed analysis of the accuracy of ET recovery is carried out for each of the methods.