Defines the rate at which the HDR window falls back to rest when the target is below the current value.
In Linear Mode (see below), it is the time in seconds it takes to drop by approximately 10 decibels.
In Exponential Mode, it is the time in seconds it takes to reach approximately 0.37 (1/e) of the difference between the target and the current value.
Refer to Working with HDR Ballistics for more details.
Default value: 0
Range: 0 to 20
Units: s