Model predictions for the [Pb/Fe] vs. [Fe/H] abundance pattern. Upper panels: predictions for a single infall and for different contributions from AGB stars (Model 1 and Model 2) as well as different initial rotational velocities (IRV) of massive stars (Model 3 and Model 4). Lower panels: predictions for models with more than one infall, massive stars yields weighted with the DIS2 distribution of rotational velocities, and new yields from AGB stars (Model 5 and Model 6). For the models details we refer to Table 6.