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{{#category_index:R|residual}} (r∂ zij’ ∂ w∂l) 1. The difference between observed data and the regional, as in gravity and magnetics. What is left after the regional has been removed. See residualize and Figure R-10. 2. An anomaly, the difference between measurement of a quantity and the expected value; what is not otherwise accounted for. 3. Salt residual (q.v.).