The p-Low setting, sets the lower level of CPAP during the release phase.
The term "p-Low" is used in Draeger & Hamilton medical ventilators.
The above image shows the p-Low setting on the Draeger, Evita XL.
The highlighted setting "PEEP" is the p-Low setting in Bi-Level, on the Servo-i ventilator.
The "PEEP-L" setting is used in Bi-level (PB 840) to mimic p-Low.