Zoom-in on the evolution of segmentation results generated by UNet++ 10^–3 model in mosaics 160–171° (six top images) and 349–356° (six bottom images). Here, the estimated binary filament masks are displayed at classification thresholds 0.8, 0.5, 0.2, and the optimal threshold. The original H₂ column density image (image with the color bar) and the true input filament mask are also displayed for comparison. The regions are 2° × 2° wide.