A method and system for measuring hydrocarbon content in a gas sample measures individual hydrocarbon concentrations in the gas sample and determines a total concentration based on the individual concentrations. The apparatus preferably includes means for formatting the disk recording medium; and means for controlling the order of format by informing the formatting means of a zone to be formatted next at an interval of one or more zones and of the neighboring zones if the number of defects in the zone is higher than the threshold value. A rack and pinion drive for moving a sheet over the frame to expose a portion of the opening and allow air to flow into the radiator, the frame and sheet producing a smoother flow of air over and about the front of the vehicle thereby reducing the amount of drag on the vehicle while still allowing air flow into the radiator. The storage device stores a preset WAT model and qualification criteria. Responsive to receiving the new request including the unique token, a determination is made as to whether a previous request from this user is simultaneously being processed by the server. Moreover, the invention relates to a method for inserting the clip into a retaining profile.