Fig. 2
Maps of M 31 in total intensity from Planck (after CMB subtraction). Top to bottom, left to right: Planck 28.4, 44.1, and 70.4 GHz; Planck 100, 143, and 217 GHz; Planck 353, 545, and 857 GHz. All plots have units of Kelvin (TRJ), have a 1° equatorial graticule overlaid, are 250′ × 250′ with 0.5′ × 0.5′ pixels and are centred on RA 10.̊68, Dec 41.̊27, with north up and east to the left.
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