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FIT3D fits optical spectra to deblend the underlying stellar population and the ionized gas, and extract physical information from each component. FIT3D is focused on the analysis of Integral Field Spectroscopy data, but is not restricted to it, and is the basis of Pipe3D, a pipeline used in the analysis of datasets like CALIFA, MaNGA, and SAMI. It can run iteratively or in an automatic way to derive the parameters of a large set of spectra.
Mixclask combines Cloudy (ascl:9910.001) and SKIRT (ascl:1109.003) to predict spectra and gas properties in astrophysical contexts, such as galaxies and HII regions. The main output is the mean intensity of a region filled with stars, gas and dust at different positions, assuming axial symmetry. The inputs for Mixclask are the stellar and ISM data for each region and an file for the positions (x,y,z) that will be output.