Notes. We note that the extended fraction of our samples is particularly high for the J0515 NBs, suggesting that this filter is affected by a high level of contamination from extended low-z interlopers. Indeed, this is the only NB among the four that is susceptible to contamination from the strong [OIII] _{4959 + 5007} doublet and H _β line in addition to [NeIII] and [OII]. Sources with at least one identification as a secure interloper are excluded; the final number counts of Lyα-emitting candidates are shown in the last column on the right. The average sky density of these objects shows significant variation among the four lists, with an average of ∼4 deg⁻² sources per filter. The complete catalogues of genuine candidates (i.e. after excluding securely identified interlopers) can be found at: https://www.j-plus.es/ancillarydata/dr1_lya_emitting_candidates.