Label conspicuous spectral features: with radis?

[gully]

We want to label the conspicuous spectral features. My first guess for how to do this is with radis, with a characteristic temperature and pressure. That might be overkill, but it is certain to work and can be run uniformly for a range of species. Besides, I'm fond of the radis community and their great algorithmic advances, including GPU and recent exomol support.

Still, this feels like a lot of work, maybe a few days just to get everything working. It'll be worth it, but it's not free. So any suggestions for free alternatives are welcomed!