Fig. 6

Mean cross-PCA scores plotted as a function of the peak ratio threshold \(\tau\) for important intra-class (same source) and inter-class (distinct sources) comparisons. Each plot shows the average cross-PCA score taken over all possible pairings of injections for the corresponding comparison class (e.g. NIST vs. NIST plot shows the average cross-PCA score for three possible parings between the three NIST injections). Macondo refers to any crude oil sample originating from the MW, source of the Deepwater Horizon disaster