Radial profiles at 100, 160 and 250 μm are compared with the IRAC 3.6 μm and MIPS 24 μm emission. The solid black line represents the optical diameter adopting D25 = 37.7 kpc and the two dashed black lines demark the break radius found at ±12 kpc from Bianchi & Xilouris (2011). The alternative y-axis scale refers only to the dust temperature profile obtained from modelling the SED (see Sect. 4.3), represented by the solid red line.
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