  Spectroscopic data in wavelengths 900--3000A have been obtained in a low flux
state of the nucleus of the Seyfert 1 galaxy NGC 3516. The line profiles show P
Cygni characteristics, particularly in O VI 1032A, and are compared with data
from an earlier higher state. The profiles are suggestive of, and consistent
with, an accelerating wind driven by a disk continuum source, in which the
ionisation radii have changed. This scenario may apply to the formation of
other broad emission lines in AGN.
