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Fig. 3

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Contours of the integrated intensity W(A+ 20,2 → 10,1) (vertical dashed lines) and the integrated intensity ratio W(E2)/W(E1) (horizontal dashed lines) intersect on a grid of RADEX models to yield gas density nH2 and N(A-CH3OH) in offsets from +30″ to +120″ in IC 348.

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