Halo mass fractions f_u(M) as a function of halo mass for the different components in our model at z = 0: The halo CDM fraction is constant at Ω_c/Ω_m for all halo masses. Star formation efficiency peaks around M_* = 10^12.5 h⁻¹ M_⊙ with a mass fraction A_* = 0.03, it saturates at high mass at a value of f_* = A_*/3. Stars are split into central and satellite, with the halo stellar content being dominated by centrals at low masses and by satellites at high mass. The bound gas fraction is near to the universal baryon fraction for high halo masses, but decreases below half the universal fraction for halo masses lower than M₀ = 10¹⁴ h⁻¹ M_⊙, the remaining baryons that are neither bound gas or stars are considered to be in unbound gas that is not in the halo. The total mass fraction drops from unity at lower masses due to the ejected gas.