Ionizing photon production per unit UV luminosity, ξion, as a function of the absolute UV magnitude (top panel) and the UV slope (bottom) of the five Lyman continuum leakers of I16a,b. Large red symbols show ξion, large blue symbols after correction for UV attenuation (two blue triangles are indistinguishable). The cyan band illustrates canonical values for the intrinsic . Recent determinations of for LBGs at z = 3.8–5 and z = 5.1–5.4 from Bouwens et al. (2015) are shown by small black and magenta symbols with error bars, respectively.
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