Fig. 3
Proposed formation routes for ethyl formate. Solid arrows indicate chemical reaction on grain surface, while dashed arrows correspond to gas-phase reactions. The references for the different pathways are: Tielens & Whittet (1997), Beltrán et al. (2009), Woods et al. (2012; red arrow); Hama & Watanabe (2013; green arrow); Garrod et al. (2008), Belloche et al. (2009; blue arrow); and Taquet et al. (2016; dashed black arrows).
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