Comparison of the first (p₀; top row) and second (p₁; bottom row) PCA coefficients vs. the peak absolute magnitude for each NIR band. The Pearson correlation coefficient (ρ) and p-value for each of the comparisons, with their respective 1σ uncertainty estimated by Monte-Carlo sampling, are shown with the respective linear relations (red lines). The null-hypothesis is that there is no correlation (zero slope). The panels have the same x- and y-axis ranges for visualization purposes.