Example of variations in SKY-STD across all images taken during a single night. Left panel: Variations in SKY-STD as a function of detector number, highlighting discernible differences in image quality among detectors. Middle panel: Correlation between SKY-STD and airmass for selected detectors, illustrating the impact of zenith angle on image quality. Right panel: Distribution of computed weights for all images from the night, reflecting the range of observational quality.