  The sextupole magnets in the Low Energy Ring (LER) of PEP-II are grouped in
pairs with a phase advance of 180 degrees. Displacing the magnets or moving the
orbit to displace the beam in the magnets in an antisymmetric way creates a
dispersion wave around the ring. This can be used to correct the vertical
dispersion in LER without changing the local coupling. Results from simulations
are shown.
