Fig. 6.

Spectra for individual points (numbered, see Fig. 5) examined across the 300 μm wide traverse in sample #2. All spectra are normalized to the intensity of the ~2940 Δcm^-1 C–H symmetric stretching band (i.e., the strongest band in each spectrum is scaled to 100%) and then stacked along the y-axis for better comparison. The mineral content, represented by the P–O symmetric stretch at 960 Δcm^-1, can be seen to gradually increase along the traverse from tendon to bone. The spectrum increasingly acquires the characteristics of an apatite spectrum starting at position 3 and barely changes between positions 10 and 12. The increase in mineral concentration is very obvious between positions 5 and 10.