α-elements over iron abundance as a function of metallicity for sub-sample e. Filled dots are thick disc sequence stars, open circles are thin disc sequence objects. Metal-poor stars ([M/H] < −1.0) are marked with filled triangles and asterisks, depending on whether their [α/Fe] are in the high-α or the low-α regime. The black line shows the proposed division between the thin and thick disc sequences in agreement with Fig. 11. The red line shows the separation proposed by high-resolution analysis of Adibekyan et al. (2012) for the solar neighbourhood. The blue solid line is the separation proposed by Lee et al. (2011b) from low-resolution SEGUE data and the two dashed lines indicate their dividing points for the thin and the thick disc stars to avoid misclassifying stars.