Distribution of hydrocarbons formed in the aromatization of a) methanol over H-GaAl-ZSM-5 at 5508C, b) methanol over Mo-Zn/H-ZSM-5 at 5008C, c) ethanol over H-GaAl-ZSM-5 at 6258C, and d) dimethyl ether (DME) over H-GaAl-ZSM-5 at 5508C in the presence (solid bars) and absence (open bars) of methane.