Overview of AIA 1600 Å base difference light curves in different subregions. Top left: Map showing the maximum pixel values in AIA 1600 Å base difference maps during the given time interval with four subregions marked. Bottom left: HMI LOS magnetogram with contours (25 DN/s) of the maximum AIA 1600 Å brightness map above. Right: Light curves showing the time evolution of the total AIA 1600 Å base difference counts in each of the marked subregions. The emission in the total flare mask shown in the top panel is further divided into emission from pixels corresponding to a positive or negative polarity region, as derived from the shown HMI LOS magnetogram. The STIX 15–25 keV light curve (green) is shown as a reference, and peak times of the HXR pulsations are marked by dashed lines and numbered at the top.