Besides the behavior of the wings, a relevant problem for the use of Voigt functions needs to be noted. To evaluate these functions, it is required a numerical approach because the convolution is an integral which cannot be solved analytically. The result is consequently depending on the model representing the convolution and, also, on the language used to implement the calculus and the related compiler required to obtain the numerical results. Some could claim that, today, due to the speed of computers we have no problems in any numerical calculus, however the problem of the used models remains, because it has nothing to do with the speed of the calculus.