Demonstration of Method A. Left: example LC of the system OGLE-LMC-ECL-01350 divided to three intervals. Green line represents linear fit, black lines show the limits for removal of the outliers (−3σ, +7σ). Right: phase curve for the whole LC fitted with a Fourier series of the 5th order (red line). Green line marks detected primary minimum, gray lines represent detected region of the drop in brightness.