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Timing studies have proved particularly challenging on time scales of a few tens of seconds to minutes. This is due to the modulations produced in the light curves of a constant source as the detector wobble periodically causes source occultations by the window-support wire grid. It has not been possible to date to effectively remove the effect of the wobble from the source light curve. In part, the problem is that the wobble is not strictly along a single vector, and it varies slightly in amplitude and time scale. The accuracy to which the PSPC grid is mapped is also a limiting factor in removing the effect.