Criteria III and IV reduce the light curves from 719,628 (green) to 2247, as shown in the box on the upper left side. The light curves that do not pass criterion VI are marked in yellow. We show the 23,001 variables published in the WeCAPP variable star catalog from Fliri et al. (2006) in magenta, as well as the 91 novae from Lee et al. (2012) in blue. The final 12 microlensing events are shown in red. We note that the declining parts of nova light curves resemble microlensing events and often make short-timescale novae the major contamination in microlensing detections. In this regard, we show that criteria III and IV can efficiently discriminate microlensing events from novae, and hence remove their contamination.