Objects from the GAMA catalogue plotted on the magnitude-p_star plane and separated depending on whether they are designated as stars (left panel) or galaxies (right panel) in the GAMA catalogue. There are 620 131 objects in the left panel and 481 130 objects in the right panel. The colour coding shows the number of objects in each section of the panels. The black lines in each panel show the fraction of objects that are correctly identified by TOPz (p_star ≥ 0.5 for stars, and p_star < 0.5 for galaxies) per magnitude bin. For galaxies, the fraction of correctly classified objects over all magnitude bins is 99.8 per cent.