Flux density of the features in the satellite OH lines as a function of right ascension toward W33. ΔRA = 0 corresponds to the position of W33C. Features with similar radial velocities are designated 3a, 4a and 3b, 4b in the 1612 and 1720 MHz lines, respectively. The strong 1612- MHz maser feature at 62.3 km s^-1 (shown with bold line in the upper panel) certainly belongs to W33B.