Clustering

Depending on the data set, Bubbles can be drawn with the same X and Y position and the same radius. The accumulations of bubbles are then characterized by the fact that they lack any labeling and the border is drawn thicker. 

If the mouse is hovered over such a Cluster of bubbles, the underlying bubbles fan out aside. The front bubble is displayed completely including their labels.

If one of the fanned bubbles is now hovered, this one is brought to the foreground and displayed in the correct (original) position with its labels.