The graph displays the other subjects mentioned on the same pages as the subject “U.S. Steamer Manzanita”. If the same subject occurs on a page with “U.S. Steamer Manzanita” more than once, it appears closer to “U.S. Steamer Manzanita” on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.