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The illustration of the considered HA supercell containing 352 atoms, as viewed from the c-axis. The bold black lines illustrate the hexagonal unit cell of HA (contains 44 atoms, Figure 1) in the considered orthorhombic supercell. The blue and green circles show, respectively, the first and second rows of calcium atoms around the OH-channel. Atom color differentiation: cyan—calcium; orange—phosphorus; red—oxygen; white—hydrogen. Adapted from [37].
