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This section reviews the basic steps of non-linear frequency-domain waveform inversion. The reader wishing to have a more formal overview is referred to Pratt and Worthington (1989), Liao and McMechan (1996), Sirgue and Pratt (2004), and references therein. The technique described herein is modeled after the algorithm of Pratt and Worthington (1989) and uses the notation of Sirgue and Pratt (2004). Additional steps in the inverse approach are drawn from time-domain waveform inversion method of Mora (1987).