  DAOSPEC is a Fortran code for measuring equivalent widths of absorption lines
in stellar spectra with minimal human involvement. It works with standard FITS
format files and it is designed for use with high resolution (R>15000) and high
signal-to-noise-ratio (S/N>30) spectra that have been binned on a linear
wavelength scale. First, we review the analysis procedures that are usually
employed in the literature. Next, we discuss the principles underlying DAOSPEC
and point out similarities and differences with respect to conventional
measurement techniques. Then experiments with artificial and real spectra are
discussed to illustrate the capabilities and limitations of DAOSPEC, with
special attention given to the issues of continuum placement; radial
velocities; and the effects of strong lines and line crowding. Finally,
quantitative comparisons with other codes and with results from the literature
are also presented.
