(a) Dependence of the FUV absolute magnitude on the stellar mass M_⋆. Black-filled circles are high-z galaxies (Bridge et al. 2019; Endsley et al. 2021; Karman et al. 2017; Rasappu et al. 2016; Khusanova et al. 2020; Tang et al. 2021; Strait et al. 2020b; Santos et al. 2020). Relations for high-z galaxies by Song et al. (2016), Grazian et al. (2015) and Yung et al. (2019) are represented by yellow, cyan and green lines, respectively. (b), (c) SFR versus the stellar mass and the sSFR versus the stellar mass, respectively. Black-filled circles in both panels are high-z galaxies (Karman et al. 2017; Amorín et al. 2017; Sanders et al. 2020a; Erb et al. 2016; Holden et al. 2016; Khusanova et al. 2020; Rasappu et al. 2016; Santos et al. 2020; Troncoso et al. 2014; Strait et al. 2020a,b; Reddy et al. 2006; Hagen et al. 2016; Onodera et al. 2016; Santini et al. 2017; Cullen et al. 2014; Saxena et al. 2020; Endsley et al. 2021, 2020; Tang et al. 2021; Jones et al. 2020). White solid lines, yellow solid lines and cyan solid lines in (b) and (c) represent relations for high-z galaxies by Arrabal Haro et al. (2020), Iyer et al. (2018) and Florez et al. (2020), respectively. (d) The dependence of the [O III] λ5007/Hβ flux ratio on the stellar mass M_⋆. Black-filled citcles represent high-z galaxies (Richard et al. 2011; Schenker et al. 2013; Steidel et al. 2014; Troncoso et al. 2014; Holden et al. 2016). The most metal-poor nearby galaxies with 12 + log O/H ∼ 6.9–7.25 (Izotov et al. 2018c, and in prep.; Kojima et al. 2020) are shown by encircled blue-filled circles. The meanings of other symbols in all panels are the same as in Fig. 1.