Part of the input data required for all NLTE codes include information of the atomic species of interest via the so called model atoms. These are often not public, making difficult the comparison between different codes. Here I present the IDL/GDL code maKe Atoms Simple (KAS), a code that collect, combine and reorganize atomic data in order to

Context. Very metal-poor halo stars are the best candidates for being among the oldest objects in our Galaxy. Samples of halo stars with age determination and detailed chemical composition measurements provide key information for constraining the nature of the first stellar generations and the nucleosynthesis in the metal-poor regime. Aims: Age

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