a) HMI magnetogram of AR NOAA 12353. b) Positive (red), absolute negative (blue), and total (black) flux profiles extracted from the rectangular box (red) region shown in the left panel. The GOES soft X-ray flux profile in 1–8 Å channel is also plotted with negative flux profile. The vertical dashed lines indicate the B6.0 and C2.3 flare durations. c)–f) Selected HMI magnetograms of the flare site showing flux cancellation (within blue rectangular box). The x- and y-axes are labeled in arcsecs. The shear motion and rapid flux cancellation between N1 and P1 is shown in the HMI magnetograms movie (bottom panels) available online.