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The drawing, as assembled in the center, consists of many individual segments or parts, each of which is shown separately around the perimeter - stones from different periods in the history of the upper courtyard, reconstructed portions, stones of different material (marble and the soft local limestone called poros), stones used for different purposes (steps, wall veneer, cross wall, etc.), stones in situ versus in situ but in secondary use, versus stones no longer in situ at all.
Return to the CSA Newsletter article, "CAD Data Segmentation - A Crucial Tool"