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The data set that we use for our analysis corresponds to a 2D OBC experiment in the Gulf of Mexico, in the Mahogany field. Rosales and Guitton (2004) present the preprocessing for this data set. After combining the hydrophone and geophone components, we still have the multiples related to the water bottom. For this particular data set, we can consider the water bottom to be flat throughout the data Herrenschmidt et al. (2001). Therefore, we can apply the Delft methodology to CMP gathers, for the elimination of the water-bottom multiples.