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(a) Oil droplet groupings identified by the PAM clustering analysis of the relative intensity of the four MCR components of the emission spectra. The x- and y-axes are principal components (PC) 1 and 2 derived from the MCR spectral components. The contributions of these components are represented by the arrows superimposed on the plot. (b) A stacked bar chart shows the mean relative intensity of the four MCR components of the emission spectra within each of the droplet groups.
