Azimuthal distribution of the residual of the oxygen abundance for the individual H ii regions after subtracting the average radial gradient. The colors and sizes indicate the galactocentric distance, with blue solid circles corresponding to H ii regions nearer to the center of the galaxy, and red or orange ones corresponding to those farther away. The solid line corresponds to the average value at each azimuthal angle for H ii regions within 25° of the considered angle.