Question

are special versions of a given issue of a magazine, in which editorial content and ads vary according to some specific demographic or regional grouping.

Answer 1

Split runs.

Step-by-step explanation:

Split runs are special versions of a given issue of a magazine, in which editorial content and ads vary according to some specific demographic or regional grouping. A split run is a change in an advertisement, meaning a change in the wording of an ad through the run, according to some regional grouping. This is usually used to test the effectiveness of the different versions.