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Bar frequency reaches a maximum of $\\approx 0.70$ at $M_{\\star} \\sim 10^{9.7} M_{\\odot}$, declining to both lower and higher masses. It is roughly constant over a wide range of colours ($g - r \\approx 0.1$-0.8) and atomic gas fractions ($\\log (M_{HI} / M_{\\star}) \\approx -2.5$ to 1). 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