Left panels: evolution with time of the total AM of gas + new stars (dashed line), old stars (dotted line) and the dark matter halo (dashed-dotted line) in the region at r < 20 kpc from the center of the primary galaxy during a minor merger with a satellite galaxy on a direct orbit. From top to bottom, the gas mass fraction of both primary galaxy and merging satellite are 20%, 10% and 0, respectively. The AM is in units of 2.2 × 10¹¹   M_⊙ kpc km s^-1. Right panels: the evolution of the AM of the corresponding components (gas + new stars, old stars and dark matter halo) of isolated galaxies with the same initial structure as the primary galaxies in the minor merger simulations.