  4DAO is a FORTRAN code designed to launch automatically DAOSPEC (Stetson &
Pancino 2008) for a large sample of spectra. The main aims of 4DAO are: (1) to
allow an analysis cascade of a list of spectra provided in input, by
automatically writing the input DAOSPEC files and managing its output files;
(2) to optimize automatically some spectral parameters used by DAOSPEC in the
process of equivalent width measurement, above all the Full Width Half Maximum;
(3) to mask some spectral regions (telluric lines, interstellar features,
photospheric lines with prominent Lorenztian wings) that can bias the correct
equivalent width measurement; (4) to provide suitable graphical tools in order
to evaluate the quality of the solution, especially of the Gaussian fit to each
individual spectral line; (5) to provide the final normalized, zero radial
velocity spectra.
