Fig. C.1.
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Baldwin-Phillips-Terlevich empirical optical emission-line diagnostic diagram using the optical line ratios [N II]/Hα and [O III]/Hβ. Shade areas represent the distribution of galaxies with both u′ and r′ meaningful Petrosian magnitudes in the SDSS catalogue. The dashed line, computed by Kauffmann et al. (2003), delimits the star-forming galaxies region. The FRB 20240114A host galaxy is marked by a filled star. The orange arrow marks the [N II]/Hα upper limit for the FRB 20121102A host (Tendulkar et al. 2021); FRB 20181030A (Bhardwaj et al. 2021) and FRB 20201124A (Bruni et al. 2024) hosts are marked in red and green, respectively.
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