But total flow is skewed when one county is an order of magnitude bigger than another in size. If you are going to compare counties which are not a fixed physic

But total flow is skewed when one county is an order of magnitude bigger than another in size. If you are going to compare counties which are not a fixed physical size, you at least need to account for differing physical size's effects on population or you can't reasonably compare. Were the counties a quarter of their current physical size, capita split and all, would they still appear as significant?