Corey-fit and IFT-scaling analysis code for gas-brine relative permeability (Version 1.0.0)

Python analysis code accompanying the manuscript "Comparative Gas-Brine Relative Permeability of H₂, N₂, and CO₂ under Subsurface Storage Conditions" (Li et al., 2026, Geophysical Research Letters). The code performs Corey-type relative permeability fitting with a free water endpoint coefficient, extracts crossover saturations with replicate-based uncertainties, fits a common interfacial-tension-based power-law scaling, and reproduces the figures of the manuscript. The companion experimental dataset is archived at DOI 10.5281/zenodo.20724303