  Context. The homogenization of the stellar parameters is an important goal
for large observational spectroscopic surveys, but it is very difficult to
achieve it because of the diversity of the spectroscopic analysis methods used
within a survey, such as spectrum synthesis and the equivalent width method. To
solve this problem, constraints to the spectroscopic analysis can be set, such
as the use of a common line-list. Aims. We present a procedure for selecting
the best spectral lines from a given input line-list, which then allows us to
derive accurate stellar parameters with the equivalent width method. Methods.
To select the lines, we used four very well known benchmark stars, for which we
have high-quality spectra. From an initial line-list, the equivalent width of
each individual line was automatically measured for each benchmark star using
ARES, then we performed a local thermodynamic equilibrium analysis with MOOG to
compute individual abundances. The results allowed us to choose the best lines
which give consistent abundance values for all the benchmark stars from which
we then created a final line-list. Results. To verify its consistency, the
compiled final line-list was tested for a small sample of stars. These stars
were selected to cover different ranges in the parameter space for FGK stars.
We show that the obtained parameters agree well with previously determined
values.
