Percentage of objects with detected secondary UV emission lines red-wards of Lyα for the full sample (circles) and the subsample of LAEs (squares). The percentages are provided for all fields studied, the MUSE-Wide data (1 h depth), the UDF mosaic data (10 h depth) and the UDF10 pointing (31 h depth). The error bars indicate the 95% confidence Clopper–Pearson interval of the binomial distribution for k UV line detections given the n available objects searched (see Table 3).