Distributions of gas fractions (upper left), star formation rates (upper right), color (lower left), and metallicity (lower right) for lopsided disks with A₁ >  0.1 (blue) and remaining disks with A₁ <  0.1 (red). Measurements of the properties were done within 2r_1/2, except for the color, which is estimated from all stars in the galaxy. All histograms were normalized to unity.