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).