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We present an improved version of FIT3D, a fitting tool for the analysis ofthe spectroscopic properties of the stellar populations and the ionized gasderived from moderate resolution spectra of galaxies. FIT3D is a tool developedto analyze Integral Field Spectroscopy data and it is the basis of Pipe3D, apipeline already used in the analysis of datasets like CALIFA, MaNGA, and SAMI.We describe the philosophy behind the fitting procedure, and in detail each ofthe different steps in the analysis. We present an extensive set of simulationsin order to estimate the precision and accuracy of the derived parameters forthe stellar populations. In summary, we find that using different stellarpopulation templates we reproduce the mean properties of the stellar population(age, metallicity, and dust attenuation) within ~0.1 dex. A similar approach isadopted for the ionized gas, where a set of simulated emission- line systemswas created. Finally, we compare the results of the analysis using FIT3D withthose provided by other widely used packages for the analysis of the stellarpopulation (Starlight, Steckmap, and analysis based on stellar indices) usingreal high S/N data. In general we find that the parameters for the stellarpopulations derived by FIT3D are fully compatible with those derived usingthese other tools.

Pipe3D, a pipeline to analyze Integral Field Spectroscopy data: I. New fitting phylosophy of FIT3D