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+function Tbig = divide_by_pot(Tbig, Tsmall)
+% DIVIDE_BY_POT Tbig /= Tsmall
+% Tbig = divide_by_pot(Tbig, Tsmall)
+%
+% Tsmall's domain must be a subset of Tbig's domain.
+
+smallp = extend_domain_table(Tsmall.p, Tsmall.domain, Tsmall.sizes, Tbig.domain, Tbig.sizes);
+smallp = smallp + (smallp==0);
+Tbig.p = Tbig.p ./ smallp;
+
+smallu = extend_domain_table(Tsmall.u, Tsmall.domain, Tsmall.sizes, Tbig.domain, Tbig.sizes);
+Tbig.u = Tbig.u - smallu;
+