Fractional abundances for each of the ratios. The contour levels of a kernel density estimate are added to highlight the distribution, each representing 20% of the distribution. For both, we show the observational limit of 10⁻¹² that we used throughout. Only the ratios above either observational threshold were used to train the SHAP explainers. The blue line represents all log-ratios of −12, and the red line represents the log-ratios of 12.