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In this section, the multiple model computed in the preceding section
is subtracted from the data with two techniques. The model is
obtained after shot interpolation with the sparseness constraint. The first technique
is a pattern-based method introduced in Chapter
that separates primaries from multiples according to their
multivariate spectra. These spectra are approximated with
prediction-error filters. The second technique adaptively subtract the
multiple model from the data by estimating non-stationary matching
filters (see Chapter ). The two methods are now
briefly described.