A unified function for approximating the spectral-line contour

@article{Cherkasov2005AUF,
  title={A unified function for approximating the spectral-line contour},
  author={M. R. Cherkasov},
  journal={Journal of Applied Spectroscopy},
  year={2005},
  volume={72},
  pages={775-780}
}
A simple analytical function to describe the spectral-line contour is suggested; it depends on four parameters whose variation allows one to regulate, in rather wide limits, the character of the frequency dependence and introduce asymmetry.