  In a recent mathematical approach, Netzel (2018) proposes a method for
determining the statistical error of spectral line equivalent widths. Using
various approximations, he derives a determination equation that differs
significantly from earlier approaches by Vollmann \& Eversberg (2006) and
Chalabaev \& Mailard (1983) and evaluates these works with his approach.
Several points stand out, which have a not to be neglected influence on the
evaluation of this approach.
