I need to change the number of grid points in the relaxation zone (Buffer Zone) of RegCM3. I think this model by default have 12 grid points in relaxation zone but I want to change it to 8 grid points. Because I need to discard the buffer of eight grid points from each side of the domain in a comparison study. In which file I have to make changes?

Also is it possible to force RegCM3 to create output on daily based rather than hourly files?