This example uses computer-generated data to mimic a Hertzsprung-Russell plot (Struve and Zebergs 1962, p. 259) of the temperature and luminosity of stars. The data are plotted and displayed in Output ...

As you look from left-to-right in the diagram in Output 66.1.2, objects and clusters are progressively joined until a single, all-encompassing cluster is formed at the right (or root) of the diagram.