“…In particular, the data we use for Galactic halo stars are from Gratton et al (2003), Cayrel et al (2004), Akerman et al (2004), Mashonkina, Korn & Przybilla (2007) and Shi et al (2009). For Ba, we use the data of Frebel (2010), as selected and binned by Cescutti et al (2013).…”