From top to bottom, the panels show (1) the weighted water production rates of the 11 representative facets under the dust layer removal model; (2) the corresponding rates under the constant dust layer model; and (3) the solar illumination curves of each facet. The vertical dashed lines indicate the time of perihelion passage. The insets in each panel provide a magnified view of the near-perihelion region (± 100 days), highlighting differences in peak timing, amplitude, and asymmetry between the two models, as well as their response to the rapidly changing solar flux.