SABOCA 350-μm image (smoothed to resolution) of the central part of Orion B9 (colour scale and green contours). The image is shown with a square root scaling, and the colour bar indicates the flux density in units of Jy beam^-1. The rms level is 0.06 Jy beam^-1 (1σ). The first 350-μm contour and the separation between contours is 3σ. The white contours show the LABOCA 870-μm dust continuum emission as in Fig. 1. The yellow plus signs show the target positions of our molecular-line observations. The 0.2-pc scale bar and beam HPBW are shown in the bottom right.