Feature importance using SHAP values. The features are ordered by importance from top to bottom, with the most important feature being at the top. On the x-axis, the SHAP value is displayed. A positive value indicates a higher probability that the associated source is an AGN, while a negative value is a higher probability that the source is an SFG. The value of the feature is shown via the colour, which is also displayed on the right in a colour bar. For instance, a higher radio flux results in a higher probability that the source is an AGN.