I am gratified by the interest of Hualin Zeng and Deshu Xu in my work on preferential continuation. I should mention that the method owes its origin to concepts related to the subject of Wiener regional-residual separation filtering — ideas and theory that were first introduced to me years ago by Richard O. Hansen.

When I conceived of the notion of preferential continuation, my goal was the development of a filter technique for performing useful qualitative (i.e., map/image-based) gravity and magnetic anomaly enhancements. Thus it is interesting to see Zeng and Xu test the technique in a more quantitative fashion,...

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