Temporal evolution of the areas of the pore encircled by both intensity and magnetic thresholds. Top: comparison of the area of the pore encircled by the isocontours I_c = 0.55 I_QS (red), B = 1921 G (orange), and B_ver  =  1731 G (blue). Vertical lines divide the evolutionary stages of the pore as in Fig. 2. Bottom: detail of the decaying stage. The straight lines are linear fits of the decay for each of the sub-periods (1, 2) with the continuous data available.