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XPS analysis of selected batches of β-TCP cylinders (CaP1: Ca/P = 1.496, CaP2: Ca/P = 1.497, CaP3: Ca/P = 1.497, CaP4: Ca/P = 1.498, CaP5: Ca/P = 1.500 and CaP6: Ca/P = 1.502) prior to the cell culture experiments; (a) Ca/P molar ratio; (b) O/P molar ratio and (c) C/P molar ratio. Vertical error bars stand for standard deviations (n = 3) and horizontal error bars for reproducibility (2.77*estimated standard deviation).
