Isotopic Evidence for a Cold and Distant Origin of 3I/ATLAS (Cordiner et al. 2026): ALMA Data and SUBLIME scripts

This archive contains the data and input files required to reproduce the radiative transfer modeling of the ALMA data of comet 3I/ATLAS, as used in the article "Isotopic Evidence for a Cold and Distant Origin of 3I/ATLAS" by Cordiner et al. (2026), which was accepted for publication in Nature in June 2026. These data and input files should be used in conjunction with the following publicly-available software: 1. The 1D version of the SUBLIME radiative transfer code, available from https://github.com/mcordiner/sublime-d1dc.2. The sublimed1dFit Python code for generating optimised spectral line models using SUBLIME, available from https://github.com/mcordiner/sublimed1dFit. After installation, and ensuring sublime-d1dc is avilable to execute as "sublimed1dc" on the command line, sublimed1dFit should be invoked in the terminal as follows: > sublimed1dcFit.py sublimed1dcFit.par