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Fig. A.1

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Continuum maps at 23.7 GHz for IC 342 (left), Maffei 2 (middle), and NGC 253 (right). The contour levels are, −0.3, 0.3, 0.6, 1.2, 2.4, 4.8 mJy beam-1 for IC 342, −0.6, 0.6, 1.2, 2.4, 4.8 mJy beam-1 for Maffei 2, and −2.7, 2.7, 5.4, 10.8, 21.6, 43.2, 86.4 mJy beam-1 for NGC 253. The beams are shown at the bottom left corner of each map.

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