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Start with an example of a run script for a low-resolution coupled simulation: https://github.com/E3SM-Project/SimulationScripts/blob/master/archive/v2/run.v2.LR.piControl.sh (Note: this is a private repo) . Create a new run script or copy an existing one. The path to it should be <run_scripts_dir>/run.<case_name>.sh
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Create a new post-processing configuration file or copy an existing one. A good starting point is the configuration file corresponding to the simulation above: https://github.com/E3SM-Project/SimulationScripts/blob/master/archive/v2/post.v2.LR.piControl.cfg (Note: this is a private repo)
Call it post.<case_name>.cfg and place it in your <run_scripts_dir>.
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