For example, a 2 mole% Ti-doped composition , 3f2, is less conductive than a 1 mole% Ti-doped composition , 3e2.
A 2 mole% Zr-doped composition , 4c2, is still relatively conductive, if not more conductive, compared to a 1 mole% Zr-doped composition , 4b2.