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. Author manuscript; available in PMC: 2016 Apr 7.
Published in final edited form as: Analyst. 2015 Apr 7;140(7):2093–2100. doi: 10.1039/c4an01987c

Figure 6.

Figure 6

A) Comparison of raw NIR spectra from 3 mm thick cartilage with polystyrene (solid black) and without polystyrene (dotted black) along with polystyrene spectra (solid grey). Second derivatives of NIR spectra from 3 mm thick cartilage with polystyrene (solid black) and without polystyrene (dotted black) along with polystyrene spectra (solid grey) compared in region 1 (B), region 2(C) and region 3(D). The polystyrene spectrum was divided by a factor of 10 to bring all spectra on the same scale.