Thus, under the same axial temperature gradient dT/dz, a higher |dT/d(fS1/2)| near (fS)1/2 = 1 means a larger |dz/d(fS1/2)| near (fS)1/2 = 1 and hence a longer liquid channel. The higher |dT/d(fS1/2)| of A206 suggests a longer channel for liquid to pass through and feed the grain boundary to resist cracking. If points a through h were connected by horizontal lines, they would show that ac = eg at the tops and bd = fh at the bottom. That is, the entrances of the two liquid channels are identical in size, so are the exits. The only difference is A206 has a much longer liquid channel than A356