Ionizing photon production efficiency obtained from the Hβ fluxes. We compare the C1F [O III] emitters with the EIGER sample. The blue solid line shows the running median of the C1F+EIGER sample. COLA1 presents a significantly larger ξ_ion, 0 than the C1F+EIGER median. Only objects with S/N(Hβ) > 3 are shown. The errors of the COLA1 measurement are smaller than the marker size and the errors of the EIGER sample are omitted for visual clarity.