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The practice of displaying data from two or more laps on the same graph for comparison. Overlaying your fastest and slowest laps is one of the quickest ways to find where you are gaining or losing time.
Segers calls it "the most powerful tool in any data acquisition software package" in Analysis Techniques: "overlaying and comparing different laps. Most analyses performed on race car data are comparative. When something is changed on the car, comparing a run to previous ones indicates the difference of that change." He emphasizes distance-based overlay: "By overlaying two traces as a function of distance, the performance of the vehicle and the driver can be compared at the same point on the track. Overlaying against time does not bring any meaningful conclusions because events at the same time probably happen at other locations." In multi-driver teams, "data overlays can indicate differences in driving style" between teammates sharing the same car.