Comparisons between the approximated neutral surfaces obtained by using the variable \gamma^n\, and the previous commonly used methods to obtain discretely referenced neutral surfaces (see for example Reid (1994), that proposed to approximate neutral surfaces by a linked sequence of potential density surfaces referred to a discrete set of reference pressures) have shown an improvement of accuracy (by a factor of about 5) Jackett, David R., Trevor J. McDougall, 1997: A Neutral Density Variable for the World's Oceans. J. Phys. Oceanogr., 27, page 252 and an easier and computationally less expensive algorithm to form neutral surfaces.
