GP is asking what measure of FPS. The most likely value when unspecified is usually "mean FPS" but, being a marketing graph, it doesn't explicitly say.

As long as all bars show the same, is there much difference between “mean”, “minimum” as long as the settings are sensible? Keep in mind this is one benchmark (two, really) and you won’t precisely recreate the testing conditions, and it doesn’t matter because your use case is not running the tests.