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Gaia and its complementary spectroscopic surveys combined will yield the mostcomprehensive database of kinematic and chemical information of stars in theMilky Way. The Gaia FGK benchmark stars play a central role in this matter asthey are calibration pillars for the atmospheric parameters and chemicalabundances for various surveys. The spectroscopic analyses of the benchmarkstars are done by combining different methods, and the results will be affectedby the systematic uncertainties inherent in each method. In this paper weexplore some of these systematic uncertainties. We determined line abundancesof Ca, Cr, Mn and Co for four benchmark stars using six different methods. Wechanged the default input parameters of the different codes in a systematic wayand found in some cases significant differences between the results. Sincethere is no consensus on the correct values for many of these defaultparameters, we urge the community to raise discussions towards standard inputparameters that could alleviate the difference in abundances obtained bydifferent methods. In this work we provide quantitative estimates ofuncertainties in elemental abundances due to the effect of differing technicalassumptions in spectrum modelling.

Gaia FGK Benchmark stars: Opening the black box of stellar element abundance determination