Click on image to view larger version.
Figure 1. Principal component spectrap1 to p4 (a to d) of system transfer and thickness-corrected spectra. (a) p1 showing average light attenuation for < 75% (grey) and 
75% (black) dense tissue; (b–d) p2 to p4, respectively, showing contributions from lipids, water and haemoglobins (oxy and deoxy). Areas above the dashed line represent spectral regions of interest for low density tissue, while areas below the dashed line represent spectral regions of interest for high density tissue.
