870 μm dust emission of the W33 complex from the ATLASGAL survey with contour levels of 1, 4, 7, 10, 13, 16, 20, and 30 Jy beam^-1. The positions of the water masers are indicated with black crosses. The arrows show the internal motion vectors of the two clouds W33 A and W33 B in the reference frame of W33 Main. The length of the arrow in the upper left corner corresponds to a motion vector of 1 mas yr^-1. The circle in the lower left corner shows the beam of the ATLASGAL observations. G012.88+0.48 is located at an angular distance of about 0.7 degrees to the north of W33, outside of this figure.