ENDescription
Related Subjects
The graph displays the other subjects mentioned on the same pages as the subject "P. P. I. (position plot indicator) scope". If the same subject occurs on a page with "P. P. I. (position plot indicator) scope" more than once, it appears closer to "P. P. I. (position plot indicator) scope" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.