  A simple approximation scheme to describe the width of the Voigt profile as a
function of the relative contributions of Gaussian and Lorentzian broadening is
presented. The proposed approximation scheme is highly accurate and provides
accuracy better than 10^-17 for arbitrary aLaG ratios. In particular, the
accuracy reaches an astonishing 10^-34 (quadruple precision) in the domain aLaG
less than 0.2371 and aLaG greater than 33.8786.
