Examples of source classification based on the quality of spectroscopic redshift constraints in MUSE. Left panels: spectra (black) and errors (violet) extracted from MUSE datacubes up to the rest-frame wavelength of the C IV transition (corresponding to observed 6580 Å at z = 3.25), with major spectral features highlighted by vertical dotted lines, as discussed in Section 2.1. When these features are clearly visible, the source is assigned a high-confidence redshift (upper panel). In contrast, when only the Lyα emission line is detected, the redshift measurement is considered low confidence (lower panel). Right panels: 2″ × 2″ cutouts of the MUSE white-light image used for source detection, with the sources indicated by white arrows.