Fig. 5. PG/(tissue map) ratios are proposed as a measure of relative PG content and distribution maps of PG1: (Factor 5)/(tissue map) (A) and PG2: (Factor 2)/(tissue map) (B) extracted from the spectral region 950–1300 cm^–1 modelled with five factors are shown for the control (top) and injected (bottom) goat IVD samples.