hrgeek

It's referring to the velocity dispersion of the cloud. If you imagine the cloud is rotating about a central axis, the parts of the cloud spinning toward us will have a higher relative velocity than those spinning away. The spread of these velocities is the velocity dispersion. A broad velocity width then indicates that parts of the cloud are moving rapidly compared to others, as one might observe if the cloud was being accreted by a black hole - the material closest the black hole would be travelling much faster than that at the edge of the cloud.

Why are all the traces in the thumbnail overlapping? That's not how circuit boards work.