Nucleus stellar mass as a function of the host galaxy stellar mass. We applied two estimates for the nucleus stellar mass: from r′ band nucleus flux fractions (violet) and Eq. (1) (light brown). The linear fits for both estimates are shown as solid lines. For comparison, we also include the relations from Neumayer et al. (2020; their Eq. (1)) and Georgiev et al. (2016; their early-type sample) as dashed and dash-dotted black lines. The nucleus stellar mass based on Eq. (1) for FDS12_0367 and FDS15_0232 have been omitted due to too faint g′ and i′ band nucleus magnitudes.