...$\rm -2.75 \la [Fe/H]$

The bracket notation is defined as follows:  $[A/B]\equiv\log(A/B)_\star-\log(A/B)_\odot$.

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... 3D effects

By "3D effects'' is meant differences in, for example, derived abundances when using atmospheric models including 3D, hydrodynamic modelling of the convection compared with traditional atmospheric models, which describe convection by the mixing-length approximation.

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