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Fig. 4.


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Comparison of MeX/EtX ratios among different regions of the ISM, where X = HCOO, OH, SH, NCO, and CN (from right to left). The data have been taken from the following: Zeng et al. (2018), Rodríguez-Almeida et al. (2021), and this work for G+0.693-0.027; Kolesniková et al. (2014), López et al. (2014), Tercero et al. (2015), and Kolesniková et al. (2018) for Orion KL; Belloche et al. (2009) and Kolesniková et al. (2018) for Sgr B2N; Mininni et al. (2020), Colzi et al. (2021), and Mininni et al. (in prep.) for G31.41+0.31; and Drozdovskaya et al. (2019) for IRAS 16293-2422.

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