Velocity streamlines for the two MHD simulations in Li et al. (2013). The simulations are rendered with paraview (http://www.paraview.org). Left: 3D MHD simulation of a collapsing uniform sphere with the magnetic field vector perpendicular to the rotation axis. Right: The simulation with magnetic field vector aligned with the rotation axis. The color of the arrows indicate the azimuthal velocity vector, υ_φ, in km s^-1. The solid black arrows indicate the general stream lines in the two simulations. The dark shaded colors indicate the density isocontours of n_H2 = 10^7.5 cm^-3 up to 10^10.5 cm^-3 (red).