Kernel density estimates of the density (left) and radius (right) distributions of the small planets orbiting M- (red), K- (orange), and FG-dwarfs (yellow) from the PlanetS catalog. For visibility, only the resulting mean KDE (solid line) of the 10 000 realizations and its standard deviation (filled area) are plotted. The red dashed lines are the density and radius distributions of the sample orbiting M-dwarfs without the TRAPPIST-1 system and planets below 1 M_⊕.