The general spectrum fitting strategy involved iteratively synthesizing
a spectrum, examining the fit by eye and then adjusting
the input model parameters accordingly. In some more complicated
cases, for stars with line profile shapes which depart significantly
from the rotationally broadened model (probably due to surface
abundance non-uniformities), correspondence between model and
observed equivalent widths was also verified. Uncertainties on the
final v sin i and abundance values are based on the dispersion of values
determined from many absorption lines. If few absorption lines
of an element are present in the observed spectrum, the uncertainty
includes a conservative estimate for the change in abundance necessary
to shift the synthesized spectrum well above the noise level,
and any possible normalization errors. Thus, uncertainty values presented
from spectrum synthesis correspond to a 2–3σ confidence
level.