FIGURE 6.

PLSR prediction of simulated trace chemical X concentration using a higher level of soft tissue amplitude variation. (A): Representative set of 33 spectra, showing a less pronounced phosphate peak due to the larger relative amount of soft tissue. (B–D) PLSR predictions using (B) t₃, (C) ${\widehat{\mathbf{b}}}_{\mathrm{b}}$, and (D) tls spectra. ν and r² are represented as mean +/− standard deviation.

*(p<0.05),**(p<.0001): indicates significance compared to t₃ determined by Tukey-Kramer HSD multiple comparisons

~ (p<0.05),~ ~ (p<.0001): indicates significance compared to ${\widehat{\mathbf{b}}}_{\mathrm{b}}$ determined by Tukey-Kramer HSD multiple comparisons