Temporal evolution of the magnetic properties: γ (in green, top), B (in orange, middle), and B_ver (in blue, bottom) averaged along the UP boundary in HMI_dcon maps. The filled areas stand for the standard deviation of the averaged properties. The dotted horizontal lines (1821 G and 1979 G) mark the maximum B and B_ver found in an evolving pore in HMI_dcon maps in García-Rivas et al. (2021), but retrieved from the I_c, dcon = 0.50 I_QS contour instead of the I_c, dcon = 0.55 I_QS reported in the study. The dash-dotted horizontal lines (154°, 1880 G, 1670 G) mark the average γ, B and B_ver during the slow decay as a reference. The upper vertical lines indicate the times of specific evolutionary stages: The beginning of the fast decay (purple), the end of the fast decay (green), the accumulation of new flux (pink), and the decrease in the spot area (blue). The bottom vertical lines indicate the flaring times of AR 12798. The colour relates to the GOES flare class, from lighter purple (weakest: A5.6) to darker purple (strongest: B5.4).