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I have shown that the filtering and subtraction method are linked
by a simple preconditioning transformation. I have also demonstrated
that the Spitz estimate for the signal PEF estimation prevent
stability issues when the Hessians in equation (![[*]](http://sepwww.stanford.edu/latex2html/cross_ref_motif.gif)
)
are computed.
Stanford Exploration Project
6/7/2002