222.5 GHz continuum emission from OH 17.7−2.0 in red contours. The contours are drawn at 0.625, 1.25, 2.5, 5, 10, 20, 40, and 80% of the peak value of 71.8 mJy beam⁻¹. The dashed line indicates the direction of the outflow inferred from mid-infrared continuum and H₂ observations (Gledhill et al. 2011). Left: the four labelled solid circles are the sources identified by Gaia within a radius of 2.5″ of OH 17.7−2.0 (see text). The greyscale also represents the continuum emission. Right: the polarised continuum emission (greyscale) of OH 17.7−2.0. The blue line segments indicate the linear polarisation direction where polarised emission is detected at > 3σ, where the rms on the polarised emission σ = 21 μJy beam⁻¹. This means that the uncertainty on the direction is ≲10°. The segments are scaled by the linear polarisation fraction which peaks at P_l, max = 0.47%. The filled ellipse indicates the beam size of the observations.