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Fig. 12.

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Abundances of C2H5OH and HCOOH relative to CH3OH toward the NGC 253 CMZ (orange star), compared to those measured toward Galactic hot cores (red squares; Ikeda et al. 2001) and Galactic Center giant molecular clouds (green circles; Requena-Torres et al. 2006). Upper limits to C2H5OH and HCOOH are represented by open symbols.

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