From Northwestern University Center for Atom-Probe Tomography
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Interprecipitate Distance Distribution algorithm.

The edge-to-edge interprecipitate distance is an important quantity for many physical properties, including the yield strength, conductivity, and coarsening behavior. Because LEAP tomography is able to analyze a large number of precipitates, it can be used to find the interprecipitate distance distribution. The precipitates in this Fe-Cu alloy are fit as ellipsoids and the distances between them are calculated, as described in Direct Measurement of 2-Dimensional and 3-Dimensional Interprecipitate Distance Distributions from Atom-Probe Tomographic Reconstructions

(Courtesy: Richard Karnesky and Dieter Isheim)