This tale sets the duty cycle you want the air bleed solenoid to act at. This controls how much the valve opens, and how much air will bleed out if there is boost pressure.
The input axis can changed to any channel by pressing F3 when the table is selected. Race Time is used as the default, but Launch Control Output State is also popular, with axis values 0 (launch control off) and 1 (launch control on). Typical table output values would then be 0% when launch control off and 100% when launch control on.