Deprojected 1.21 mm continuum image of AFGL 4176 mm1-main in greyscale and contours, with the central compact source subtracted (contours: σ = 23 μJy beam−1 × −5, 5, 7, 10, 12, 16, 20, 25, 30). The rotated and deprojected beam is shown in the bottom left corner. The best fitting logarithmic and Archimedean spiral models (cf. Fig. 3) are plotted as blue dashed and red solid lines on the western (right) spiral, respectively. The same models rotated 180° are also shown.
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