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Fig. 2

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Energy level diagrams of OH and H2O (ortho and para). Red arrows indicate lines detected in both sources; blue arrows denote lines detected only in NGC 4418, green-dashed arrows mark transitions contaminated (blended) by lines of other species, and blue-dashed arrows denote marginal detections in NGC 4418. The small numbers in the OH diagram indicate rounded wavelengths in μm.

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