FIELD includes the width of the guardrail, and LANDFILL ZONE doesn't include the "and including" wording. That's my guess.
Quote:
FIELD – a roughly 27 ft. x 54 ft. carpeted area, bounded by and including the GUARDRAILS and ALLIANCE WALLS.
LANDFILL ZONE – the infinitely tall volume bound by the plastic lip of the STEP on the ALLIANCE’S side of the FIELD, the GUARDRAIL on
each side, and the landfill line (excluding the tape).
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