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Fig. 4.

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Line-to-FIR[42 − 122 μm] luminosity ratio as a function of FIR[42 − 122 μm] luminosity for [OI]63 μm, [OIII]88 μm, [NII]122 μm (top row), [OI]145 μm, [CII]158 μm, [NII]205 μm (middle row), [CI]370 μm, and [CI]609 μm (bottom row). W2246–0526 is indicated with a red square. The high-z quasars are taken from Weiß et al. (2003), Uzgil et al. (2016), Lu et al. (2017), Venemans et al. (2017), Walter et al. (2018), Lee et al. (2019), Novak et al. (2019), Li et al. (2020), Pensabene et al. (2021), Meyer et al. (2022). Upper limits for high-z quasars and W2246–0526 are shown with downward arrows. We note that the only high-z quasar shown for [OI]63 μm and [CI]609 μm corresponds to the Cloverleaf quasar (Weiß et al. 2003; Uzgil et al. 2016).

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