################### Version Description ################### v1.0 - v1.4 ------------ The original IDL version of PAHFIT can be found in: `http://tir.astro.utoledo.edu/jdsmith/research/pahfit.php `_. For more details and background of ``PAHFIT``, see the `background `_ page. v2.0 ------------ Adopting the astropy.modeling framework, this version of python PAHFIT matches the capability of the IDL version. Also, the modular approach has been built-in for future contributions, e.g., science/instrument packs. v2.1 ------------ PAHFIT v2.1 is an enhanced version of v2.0 that extends the fitting range down to the near IR at 2.5 µm (total wavelength coverage: 2.5--38 µm). The detail of this version is discussed in `Lai et al. 2020, ApJ, 905, 55 `_, in which the model was trained by a sample of 113 bright PAH galaxies drawn from the AKARI-Spitzer Extragalactic Spectral Survey (ASESS). The summary of the newly added components and the instruction of running the AKARI-Spitzer combined spectrum can be found in: :doc:`PAHFIT 2.1 summary ` v2.2 ------------ Enhancement to support Infrared Space Observatory spectra v2.3 ------------ Support the JWST simulated data v2.4 ------------ Support the JWST observations