Evolution of the stellar rotation period P_⋆ and the stellar radius R_⋆ for different variations from the reference model. Column a: region in which Ė_add is distributed, M_add = 0.01 (blue line), and using a different accretion history Ṁ_high (see Fig. 1, yellow line). Column b: low metallicity, Z_⋆ = 0.1 Z_⊙ (blue line), and including the influence of disk winds (model DW, yellow line). The reference model is marked in boldface.