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How to prepare a set of ensembles with RANDOMCV

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Dear Colleges,

I am going to generate 40 ensembles using WRFDA RANDOMCV capability.
What namelist variable should I change each time before running the da_wrfvar.exe when generating a new ensemble member?

Best regards,
Check Users Guide chapter:

When running WRFDA for different members, modify seed_array1 and/or seed_array2