From the rules about the Arena
Quote:
A 4.2 inch diameter post projects vertically from the center of
the hexagonal base. The top of this post is covered by an 8-inch diameter, 24-inch tall, two-color vision target. The vision target is located between 59 and 83 inches above the floor.
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As usual, the actual real life trailers may have the target slightly differnent from this...