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{{#category_index:S|stack}} 1. A composite record made by combining traces from different records. See common-midpoint stack, diversity stack, uphole stack, and vertical stack. Stacking also involves filtering because of timing errors or waveshape differences among the elements being stacked; see Figure S-20. 2. Combining a number of time-domain transient electromagnetic signals. 3. A computer buffer operated on a last-in first-out basis.