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. 2018 Jun 6;6:e4955. doi: 10.7717/peerj.4955

Figure 2. Measuring primary osteon density exemplified for Plesiosaurus dolichodirus.

Figure 2

Primary osteon density is measured as the (pink circled) area of the vascular canals with the infillings by lamellar bone (primary osteons) compared to total bone area. Photo by Corinna Fleischle.