Nucleus flux fraction as a function of host stellar mass, based on Sérsic+PSF models. Nucleated galaxies are shown in violet and non-nucleated galaxies are shown in green. Those with a fitted nucleus total magnitude of 35 mag are shown as triangles along the x-axis. The dotted, dot-dashed, and dashed red lines are the estimated BIC, visual, and BIC_res detection limits, respectively, based on our synthetic nucleation tests (see Sect. B.1).