a3cosmos-gas-evolution calculates galaxies' cold molecular gas properties using gas scaling functions derived from the A3COSMOS project. By known galaxies' redshifts or cosmic age, stellar masses, and star formation enhancement to galaxies' star-forming main sequence (Delta MS), the gas scaling functions predict their stellar mass ratio (gas fraction) and gas depletion time.
https://ui.adsabs.harvard.edu/abs/2019ascl.soft10003L and/or https://ui.adsabs.harvard.edu/abs/2019ApJ...887..235L