Comparison between gold-class and gold-weight definitions. Here, a SOM trained on tomographic bin one in our SKiLLS simulation is coloured by the true mean redshift of each cell (left), the gold-class definition of each cell under a single realisation (centre), and the gold weight of each cell after ten realisations. In the gold-weight panel, the cells, which are assigned a (highly stochastic) zero gold class in our single realisation, are highlighted with an orange border. These cells are assigned a wide range of final gold-weights, highlighting the stochasticity of the gold-class definition and the superiority of the gold-weights. In each colour bar, the PDF of cell values is shown.