README for the FAST_JX/code folder 26 Feb 2021 GEOS-Chem Support Team geos-chem-support@g.harvard.edu The tarball UCI_fastJ_addX_73cx.tar.gz is a local copy of FAST-JX utilities by Michael Prather that you can use to generate cross sections for new species. This is also stored on an FTP site at UC Irvine, but that site often goes down. Therefore, we have preserved a local copy of it here. For more information, please see this page on our KPP-for-GEOS-Chem ReadTheDocs Documentation site: https://kpp.readthedocs.io/en/latest/creating-mechanisms/reactions.html#photolysis-reactions -- Bob Yantosca (26 Feb 2021)