In the upper set of plots, the top left panel features an exposure count histogram, with a subplot presenting a cumulative bar chart of exposure counts. The top middle panel displays a δEW_Hα histogram, accompanied by a subplot showing an enlarged view of the region where δEW_Hα exceeds 0.4. The top right panel shows a histogram of the coefficient of variation for EW_Hα. Mirroring the layout and structure of the upper plots, the lower set utilizes medium-resolution data instead of low-resolution data. The third set of plots, also based on the medium-resolution sample, presents the relationships between the mean EW_Hα (〈EW〉) and its standard deviation (σ_EW) in the left panel, and between 〈EW〉 and σ_EW/〈EW〉 in the right panel. The red dots represent the median values within each bin.