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It is known that the computation of the Voigt/complex error function isproblematic for highly accurate and rapid computation at small imaginaryargument $y << 1$, where $y = \operatorname{Im} \left[ z \right]$. In thispaper we consider an approximation based on the Fourier expansion that can beused to resolve effectively such a problem when $y \to 0$.

The Fourier expansion approximation for high-accuracy computation of the Voigt/complex error function at small imaginary argument