Column header (header)

In the context of Ground Truth compilation, the column title refers to "short title versions" of chapters and subchapters which serve as orientation in the book, especially in the page header above the actual text. They can also be referred to as page titles and are often separated from the actual text by a separator. In this context, the page number is not marked as column header, but separately as text region page-number.

Figure 1. Example: column header