Comparison of [Na/H], as a result of the method test considering the common RGB stars with Carretta et al. (2006). The left panel compares the abundances re-derived by us based on the EWs of the 6154−60 Å doublet and the set of stellar parameters derived according to Carretta et al. (2006) prescriptions with those derived by Carretta et al. (2006). The right panel shows the good agreement between the spectrum-synthesis-based abundances and the (6154−60 Å doublet) EW-based values, based on our own set of stellar parameters. Here only LTE abundances are considered.