Prerequisites ============= Before starting this tutorial, ensure that: * ``GUIBRUSHR`` is installed and properly configured, including the ``petitRADTRANS`` opacity databases. Refer to the :doc:`installation instructions ` and in Appendix B of the reference paper. * The WASP-77Ab tutorial datasets are downloaded and placed in the appropriate target folder. The datasets can be obtained from ``[link to tutorial data]``. * Opacity line lists for the molecular species of interest are available at both high and low resolution in the ``petitRADTRANS`` input data directory (see below). Provided opacity line lists ---------------------------- The tutorial data package includes the opacity line lists for the three molecular species used throughout this analysis: * **H**\ :sub:`2`\ **O**: the POKAZATEL line list from Polyansky et al. (2018), which provides a comprehensive and accurate set of water vapor transitions suitable for high-temperature exoplanetary atmospheres. * **CO**: the HITEMP line list with natural isotopic abundances from Rothman et al. (2010), widely adopted for carbon monoxide at the temperatures relevant for hot Jupiters. * **CO**\ :sub:`2`: the HITEMP line list from Rothman et al. (2010). In the original analysis by August et al. (2023) and Smith et al. (2024), the UCL-4000K ExoMol line list (Yurchenko et al. 2020) was used for CO\ :sub:`2`. However, the UCL-4000K opacity tables exceed 20 GB in size, making them impractical to distribute with the tutorial package. We therefore provide the HITEMP CO\ :sub:`2` line list as a lighter alternative. For higher accuracy, particularly when targeting CO\ :sub:`2` features in detail, users are encouraged to download either the UCL-4000 (Yurchenko et al. 2020) or the more recent CO\ :sub:`2` Dozen line list (Yurchenko et al. 2025).