Knot sizes versus their distance to the center of the galaxy. From the diagram we separate three classes: offcenter (open circles), lopsided (filled circles) and centered (red squares with error bars) regions. A bisector separates two regions. Filled circles show regions in contact with the center of the galaxy and open circles show regions off-centered. Regions which overlap with the geometrical center of the galaxy are labeled “centered” and represented with squared symbols. Overplot bars account for the spatial resolution.