I'm using 4DVAR to run a test case. The total iteration number seems odd to me in the output mod.nc file. My understanding is that the total iteration equals Ninner * Nouter. However, the output iteration in mod.nc is larger that Ninner*Nouter.
In my case,
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Ninner = 7 ; Minner = 8 ; Nouter = 3 ; Mouter = 4 ; three = 3 ; iteration = UNLIMITED ; // (25 currently)