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  1. Abstract

    pyspeckitis a toolkit and library for spectroscopic analysis in Python. We describe thepyspeckitpackage and highlight some of its capabilities, such as interactively fitting a model to data, akin to the historically widely-usedsplotfunction inIRAF.pyspeckitemploys the Levenberg–Marquardt optimization method via thempfitandlmfitimplementations, and important assumptions regarding error estimation are described here. Wrappers to usepymcandemceeas optimizers are provided. A parallelized wrapper to fit lines in spectral cubes is included. As part of theastropyaffiliated package ecosystem,pyspeckitis open source and open development, and welcomes input and collaboration from the community.