This is the GEOS-Chem run directory for the 4x5 standard benchmark simulation. The benchmark simulation combines the NOx-Ox-HC-Br, UCX, and SOA chemistry mechanisms. This directory can be used with GEOS-5, GEOS-FP, MERRA, or MERRA-2 meteorology. Photolysis and aerosol .dat input files are linked to ../chem_inputs/standard. This allows us to keep a single set of these files in one location, for convenience. The HEMCO configuration file is linked to HEMCO_Config.template stored in ../chem_inputs/standard. A new HEMCO_Config.rc file will be created from the HEMCO_Config.template file each time the unit tester is run. A new input.geos file will also be created from the input.geos.template file each time the unit tester is run. This allows the location of the data files to be customized for each user. 13 Jul 2016 GEOS-Chem Support Team geos-chem-support@as.harvard.edu