Secondary disk with its spiral arms around (a) fragment 11 of run x8, and (b) fragment 12 of run x16. The background map represents density in the midplane (using the same color scale as the rest of the figures), and the arrows show the comoving velocity field. The central massive protostar is located beyond the bottom of the plotted areas in both cases. The yellow circle in (b) has a radius of 3 au.