The table of payout multiples for each hand.
It decides how good a machine is: even within Jacks or Better, the house edge is tuned by cutting only the full house and flush payouts. Example: "9/6" means 9x for a full house and 6x for a flush; the house edge is 0.46% on 9/6, 2.70% on 8/5, and 5.00% on 6/5. Check the full house and flush lines before you sit down.