Erratum to: “Apertureless near field optical microscopy: a contribution to the understanding of the signal detected in the presence of a background field” [Opt. Commun. 230 (2004) 245] - Hudlet, Sylvain; Aubert, Sébastien; Bruyant, Aurélien; Bachelot, Renaud; Adam, Pierre-Michel; Bijeon, Jean-Louis; Lérondel, Gilles; Royer, Pascal; Stashkevich, Andrei A. (Optics Communications, 2004)