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If you do not have access to the ECMWF hpc2020 file system, or if you wish to install the climatological input files in a local directory of your choice, then you can download the required data from this site: https://sites.ecmwf.int/openifs/openifs-data/ifsdata/48r1/

As a minimum you will require the packages ifsdata_rtables_48r1.tgz, ifsdata_climatology_48r1.tgz, and the files required for your selected horizontal grid resolution, which in the case of our example is ifsdata_48r1_climate.v020_255.tgz.

Download and extract these files to the files in these tarballs into the same directory in your chosen location, and the filepath of which this directory should then be set to variable OIFS_DATA_DIR.