the longitudinal magnetic fields of Ap stars are variable, and have
a typical rms of only about 300 G (Bohlender & Landstreet 1990).
Given the small number of magnetic observations (just one for HD
162725 and HD 320764, and two for HD 162305), the stars could
quite probably have been observed when the visible field configuration
produced a longitudinal magnetic field below the detection
threshold.We therefore assume that these are ‘typical’ magnetic Ap
stars with surface field strengths of about 1 kG. Inclusion of this
weak magnetic field introduces magnetic desaturation, and therefore
decreases slightly (by about 0.05 dex) the abundances inferred
from most lines.