The Georgia Negro: A Social Study - Diagram shows map of Georgia with colors to mark the number of acres of land owned by African Americans in each county [LCCN2013650439]
The pattern
This still is filed under Data as proof.
Define
A chart, map, or count that is the argument, not an illustration next to the argument.
Mechanism
Sighted evidence. The reader is asked to believe their eyes: a bar, a share, a spread on a map.
Verdict
The claim is comparative or quantitative and the figure can be read without a caption doing the sell.