A system for controlling power downshifts of a transmission includes a flare generation module, a flare control module, and a shift control module. The projection system is maintained in contract with the immersion liquid after the substrate has been moved away from under the projection system. If a period of time from start of light emission by the discharge tube to that at which the integrated value exceeds the threshold value falls within a predetermined period of time, the integrated value is reset and integration is performed again. A leakage check is performed to determine if any cells have been overerased. The purchaser then sends the confirmation number to the vendor server. A piston rod axially extends between and into the first and second cylinder piston chambers.