The left panel shows a randomly selected y-band reduced image, where fringe patterns can be clearly seen. The middle panel presents the “fringe-bias” image produced from the fringez package (for more details, see M. S. Medford et al. 2021), and the right panel demonstrated the fringe patterns have been successfully removed. Specifically, we ran the fringez-generate on a subset of images without any bright pixels (>35,000 ADU; to avoid artifacts from bright stars). The generated fringe models, separately in the zy-band, were then applied to all of the reduced images using fringez-clean.