It is often convenient to fit the measured asymmetry in a rotating reference frame (RRF). To do this, one subtracts a phase from the phase of Eq. (3.39), where is the chosen RRF frequency. The RRF frequency is taken to be slightly lower than the average Larmor-precession frequency of the muon. The precession signal viewed in this rotating reference frame has only low frequency components on the order of , where is the average precession frequency in the lab frame. This has two important consequences. The first is that the quality of the fit can be visually inspected. Second and most important, it allows the data to be packed into much fewer bins, greatly enhancing the speed of fitting.