Time evolution of the cumulative dimming mask and the extracted parameters of the major dimming region associated with the footprint of the eastern filament leg. Top panel: HMI LOS magnetogram with the dimming mask. The pixels are color-coded according to the time they were first classified as a dimming pixel (threshold: LBR = −0.5 log₁₀ relative counts). Bottom panels: Time evolution of dimming parameters (black). From top to bottom: Cumulative intensity (I_cumu), cumulative area (A_cumu), cumulative negative flux (Φ_−, cumu), and new unsigned magnetic flux density (B_{unsigned, new}). The time evolution of the derivative of each quantity is shown in blue. The STIX 15-25 keV light curve (green) is included in each panel as a reference.