Tennyson and coworkers tell that the "spontaneous emission of radiation is responsible for the natural lifetime broadening or intrinsic line width. This component of the overall line shape is described by a Lorentzian profile which is, however, sufficiently narrow to be safely neglected in favour, …" of two contributions which are the Doppler effect and the collisional broadening. The "well-known Doppler effect" has a profile (Doppler profile, DP), which is "expressed in terms of the Doppler half-width, ΓD, by a Gaussian function" . The collisional broadening is producing a Lorentzian profile. "At low pressures the Doppler effect dominates, and as the pressure increases the effects of collisions become increasingly important. As a first approximation to get the resulting line shape, the convolution of an inhomogeneous Doppler profile with a homogeneous Lorentzian profile is commonly used. It defines the so-called VP [Voigt profile], which contains Doppler and Lorentzian shapes as limiting cases." . And also: "The standard three-parameter VP, as already mentioned above, is the simplest line shape accounting for the pressure and Doppler effects." Let us stress once more that the wings of VP are always of Lorentzian type, and that VP is based on causes of broadening which are statistically independent.