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Fig. 18
CO to FIR intensity ratio. Contours represent the hard X-ray emission using the 2015 NuSTAR data (S. Zhang priv. comm.; no data inside the areas enclosed by the white dashed lines). Red: (22, 24, 26, 28) ×10−6 ph s−1 pixel−1. Blue: 19 × 10−6 ph s−1 pixel−1.
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