Abundance ratios [Al/Fe] as a function of the proton-capture elements O, Na, Mg, Si in RGB stars of NGC 2808. Different colours indicate the five populations as defined in Carretta (2015) using the Mg-Na plane (population P1: blue, P2: green, I1: red, I2: orange, E: black). In each panel the star-to-star error bars are indicated.
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