[yt-users] units

When the line self["particle_velocity_x"] is called in HaloFinding.py, does it automatically give the number in CGS units already or is it in code units? It's used in calculating the rms velocity for each of the dark matter haloes, but it's subtracting centers and multiplying other values in code units I believe, just want to make sure the calculations are done in the same units. From G.S.