"An occasion when someone is allowed to leave prison, etc." (CD)
The graph displays the other subjects mentioned on the same pages as the subject "Criminal Procedure--Release". If the same subject occurs on a page with "Criminal Procedure--Release" more than once, it appears closer to "Criminal Procedure--Release" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.