Interestingly, the arrays of octahedra forming both WO3 and W18O49 phases are aligned along the same axis <101>║<103>, respectively. This is direct indication that the oxidized WO3 phase is grown alongside with the W18O49 phase and not oxidized afterwards. This deduction is in close match with the in-situ growth in TEM as shown in Figures 3 and corresponding Therefore, during the growth multiple phase (W18O49; WO3 and other suboxides) are formed.