LyC escape fraction as a function of the deficiency Δ[S II] in [S II] (left) and Δ[O I] (right). The gray-shaded areas represent dispersion of the SDSS comparison sample at 1, 2, and 3σ. The three strongest leakers (J1256+4509, J1154+2443 and J1243+4646, in increasing order of fesc) are represented by orange to brown circles in the upper part of the plots. The other galaxies that are discussed in Sect. 4.4 are labeled in blue.
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