“…However, it is worth noting that for seismic processing tasks several approaches exist that use a specific operator and its adjoint, particularly for data interpolation (Berkhout & Verschuur, 2006;Trad et al, 2002;van Groenestijn & Verschuur, 2009), for multiple prediction (Pica et al, 2005;van Dedem & Verschuur, 2005) and for signal/noise separation (Nemeth et al, 2000). Moreover, we refer to Fomel (2003a) for other applications (stacking, redatuming, offset continuation), for which a technique is proposed to obtain a unitary modeling operator in the context of high frequency approximation.…”