O32 vs. R23 diagnostic diagram for our sample. Black dots and green squares show the GLASS-JWST and DDT samples, respectively. For reference, we plot also the SDSS galaxies from Thomas et al. (2013) as dark grey points. The LCEs from Nakajima et al. (2020) are shown red dots. The Ion2 at z = 3.2 comes from Vanzella et al. (2016), de Barros et al. (2016) as a red x sign, the low-z LyC leakers from Izotov et al. (2016a,b, 2018a,b), Wang et al. (2019) as stars, and the LCEs at z = 0.3 − 0.4 from the Low-redshift Lyman Continuum Survey (as pink diamonds, Flury et al. 2022). We show also the locus of high-redshift LCEs predicted from cosmological simulations by Katz et al. (2020) as an orange dashed line and the threshold of O32 > 5 determined in Flury et al. (2022) as a pink dashed line.