Fig. 4
Helium-metallicity (Y − Z) relation for Hii regions in BCDs, Fig. 2 of Izotov & Thuan (2004a). Filled green circles, from Izotov & Thuan (2004a); open red circles, from Izotov & Thuan (1998b); open blue triangles, from Izotov et al. (1997); open magenta pentagrams, from other data (Izotov & Thuan 1998a; Izotov et al. 1999; Thuan et al. 1999; Izotov et al. 2001a,b; Guseva et al. 2001, 2003a,b); the solid line is the maximum likelihood linear regression of all the data, Y = 0.2429 + 43 ∗ (O/H).
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