Supersector cosmic tests as performed by Joey. He waited for triple coincidence between two (small identical) trigger detectors and the EPD tile of interest. Each point is made of 20 such coincidences filled in a TProfile, so the values for each point are the average EPD tile response and the errors are standard deviation/sqrt(20).

Tiles are ordered in ascending size. Tile 1 has no "partner" being the innermost tile while all the rest have a corresponding tile (in blue) which has the exact same geometry mirrored about the center. Tiles 8-15 have the same fiber bending radius. As you go down (in pairs) from tile 7 the radius gets smaller until you hit 1 (which is slightly larger than previous tiles and thus has a larger bending radius).