About 10 percent of the special counsel’s 448-page report is blacked out . A bird’s-eye view of the report reveals the pattern of redactions. More is kept secret in the first volume of the report, which covers Russian interference in the 2016 election, than in the second, which covers possible obstruction of justice.

The report by the special counsel, Robert S. Mueller III, was released to the public on Thursday . Its redactions, made by the Justice Department, fall into four categories. They are labeled in the document using color-coded text, with categories indicating the reason for the redactions.

A majority of the redactions, about 69 percent in total, were made because the material related to ongoing investigations.

Each line represents a page of the report that included redactions.

Darker lines represent more redactions on a page.

18 percent of the redactions were based on legal rules that generally forbid the disclosure of grand jury material.

8 percent of the redactions were related to classified information that intelligence officials feared could compromise sensitive sources and methods.

5 percent of the redactions were made because the material infringed on personal privacy.