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The difference between Sorella and Ghosh’s approach [Rev. Sci. Instrum. 55, 1348 (1984)] and ours [M. Froeyen and L. Hellemans, Rev. Sci. Instrum. 56, 2325 (1985)] to obtain an expression for the Fourier transform of discrete data is highlighted. A practical advantage of our algorithm over Sorella’s is stressed.