# Article

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Keywords:
convex body; set with positive reach; normal measure; set covariance
Summary:
The information contained in the measure of all shifts of two or three given points contained in an observed compact subset of \$\mathbb{R}^d \$ is studied. In particular, the connection of the first order directional derivatives of the described characteristic with the oriented and the unoriented normal measure of a set representable as a finite union of sets with positive reach is established. For smooth convex bodies with positive curvatures, the second and the third order directional derivatives of the characteristic is computed.
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