[gradsusr] How to combine ctl files in grads?

[giacomo tricarico]

Hi, since in my GRADS's files (produced by WRF-NMM Unipost) rain is in 3h steps, I would like to combine for example 2 ctl files, so that in one I have 6h rain:how could I do this?

Thanks,Giacomo 		 	   		  
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