Fig. 3.

a) Canalicular density as a function of the osteon radius (left), osteon wall thickness (middle) and the lacunar volume fraction (right), for all osteons in the 4 samples. The straight lines denote linear regressions performed for each sample separately. The y-axis on the right side is a linear measure for the density of the canalicular network and is calculated as ${\mathrm{d}}_{\mathrm{c}}=0.537/\sqrt{\mathrm{Ca}.\mathrm{Dn}}$ (see Methods section).