A. M. Sintes, B.F. Schutz
Max-Planck-Institut fuer Gravitationsphysik (Albert-Einstein-Institut) Am Muehlenberg 5, D-14476 Golm, Germany

We describe a procedure to identify and remove a class of interference lines from gravitational wave interferometer data. We illustrate the usefulness of this technique applying it to prototype interferometer data and removing all those lines corresponding to the external electricity main supply and related features.