Mass evolution of the star-disk system. Run R_ℓ14 is plotted as a thick blue line for the sink mass, a thin line for the mass within R_kep, and as a dashed line for the mass within R_mag. A flattened core-disk structure forms at the beginning. After the sink forms, it quickly accretes most of the mass inside the disk, and the disk mass drops to about 1% of the stellar mass. The magnetized region around the Keplerian disk, though significant in size, contains much less mass. The high-resolution restarts are overplotted with the same line styles, and there is an overall good agreement.