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Pathfinder Battles Case Subscriber; Pathfinder Maps, Starfinder Adventure Path, Starfinder Maps, Starfinder Roleplaying Game, Starfinder Society Subscriber; Pathfinder Roleplaying Game Charter Superscriber

Alpha3 says:
"Special: If you are proficient in the Acrobatics skill, you gain a +3 dodge bonus to AC when fighting defensively instead of the usual +2, and a +6 dodge bonus to AC when taking the total defense action instead of the usual +4."
What is "proficient"? Trained (1 rank)? 5 ranks? Having it as a class skill?
Clarification please.