When searching for multi-year microlensing events towards the Magellanic Clouds, the question arises of the effect of the parallax-induced light curve distortion on the detection efficiency of the search algorithms. We have studied this problem in the context of an event search spread over more than 10 years (EROS+MACHO and LSST). We show that the tolerance of the standard search algorithms makes this effect negligible on the detection efficiency. On the other hand, we show that these parallax effects should be frequently detectable in the case of an LSST type survey.
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