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Always first use the eof.mv first for a given parameter, step and ensemble forecast (e.g. ens_oper or ens_2016) to create the cluster file.

Otherwise cluster_to_an.mv and other plots with clustering enabled will fail or plot with the wrong clustering of ensemble members.

If you change step or ensemble, recompute the EOFS and cluster definitions using eof.mv. Note however, that once a cluster has been computed, it can be used for all steps with any parameter.

If you rerun the eof.mv macro, it will write to a new file called for example 'ens_oper.eof.txt.latest' if the original file still exists. Make sure you rename this file to 'ens_oper.eof.txt' otherwise the plotting macros will continue to use the original ens_oper.eof.txt.