Fig. 4
Cut along the major axis of M 31. Negative values are on the higher declination side of the galaxy. The red line is 857 GHz (350 μm) and the blue line is 353 GHz (850 μm) rescaled by a factor of 1000. Various spiral arm structures, including the outermost rings at 20–30 kpc, are clearly visible at both frequencies. Fields are numbered as per Fig. 3.
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