Raw light curves in 25 adjacent pixels centered on very bright microlensing event MOA-2016-BLG-290 (top, C9b) and significantly fainter event OGLE-2016-BLG-0795 (bottom, C9a). The Y-axis values (in e⁻ s⁻¹) are very precisely measured: the uncertainties are in the range 1.8−3.6 counts, i.e., invisible on the plot above. There are 2022 epochs in each panel of the top plot and 1278 in each panel of the bottom plot. The instrumental trends have patterns that are shared by different pixels. The instrumental trends are larger (and in many cases much larger) than the microlensing signal, as the microlensed source is usually not the brightest star in a K2 pixel. For OGLE-2016-BLG-0795 we extract photometry using the central pixel and three pixels adjacent to it (bottom, left, and right).