continued. The outliers list contains a wide range of objects. Going row by row from left to right: an AGN remnant candidate (Shulevski et al., in prep.), M101, diffuse emission combined with AGN emission, diffuse emission next to a giant head-tail AGN next to a WAT (Wilber et al. 2019). As the source extraction and association software PyBDSF did not associate radio emission of objects with a large (greater than a few hundred arcsec) apparent size, these appear as multiple separate entries in the source catalogue. The SOM can thus give different parts of the same astronomical object a high outlier score. We adopt a minimum separation distance between outlying objects of 400 arcsec.