230 GHz continuum maps of W33 Main1, W33 A1, W33 B1, W33 B, W33 A, and W33 Main. The black contours are at −4, −2, 2, 4, 8, ... ·σ (1σ = 6, 5, 5, 10, 5, and 70 mJy beam^-1). Negative contours are shown with a dashed line. The map of W33 A was obtained from Galván-Madrid et al. (2010). The synthesised beams are shown in the lower left corners of the images. In the upper left corners, a 0.1 pc scale is indicated. For comparison, the white contours show the ATLASGAL continuum emission at 345 GHz (same levels as in Figs. A.1−A.6).