- Added the `add_accretion` method to `Database` for adding the accretion coefficients (see Aoyama et al. 2021), including the extrapolation from Marleau & Aoyama (2022).
- Feature in `EmissionLine` for converting hydrogen line luminosities in accretion luminosities (see updated tutorial)
- Support for the clear and cloudy model spectra from Saumon & Marley (2008), to be added with the tags `'saumon2008-clear'` and `'saumon2008-cloudy'`
- Support for the grid of model spectra from Petrus et al. (2023), to be added with the tag `'petrus2023'`
- Safe extraction of TAR files (thanks to TrellixVulnTeam)
- Added `envelope` parameter to `plot_pt_profile` and `plot_spectrum`
- Added `create_color_magnitude` and `create_color_color` methods to `ReadModel`
- Support in `plot_color_magnitude` and `plot_color_color` for output from `ReadModel`
- Refactored working with companion data and added the *companion_data.json* file to the repository (see updated tutorial)
- Started implementing `pooch` for downloading files
- Added spectra of GQ Lup B to `companion_spectra`
- Added `inc_model_name` parameter to `plot_spectrum`
- Added `get_condensation_curve` function to `retrieval_util`
- Updated documentation, docstrings, and tutorials
- Minor maintenance and improvements to code style