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The historical works in gradient space had 2-D space plots of almost all possible geological structures. Evaluation of recent work by this method for interpretation of a sedimentary basin showed that error entrance caused by lots of approximations must be eliminated. As a more complete and less approximated geometrical interpretation method, 3-D space plots were offered. These kinds of plots contain more details and also they are suitable to use for not only basin but also all dominant anomaly's shape. There isn't any estimation of density in this method because density estimation doesn't appear in this method procedure at all.