Fraction of planets sorted into our six planet categories for each stellar population. The total number of planets is normalised for each stellar population such that all composition-based categories (Gaseous, Rocky, Water-rich) add up to 1 and all mass-based categories (Giant, Super-Earth, Earth-mass) add up to 1. The most common planet formed is rocky in composition and Earth-like in mass. Due to the overall high [Fe/H] of α-poor stars, water-rich planets and super-Earths are most common around these stars.