Chemical species and detected fractional abundances in the three studied regions of IRAS 16293. Upright bars in gray correspond to desorption zones of H₂ O, H₂CO and CO (see text). The temperature is given in K, the molecular density in cm⁻³, and the distance in AU. References: 1. Ceccarelli et al. (2001). 2. Doty et al. (2004). 3. Bottinelli et al. (2014). 4. Carty et al. (2005). 5. Rivilla et al. (2018). 6. Sakai et al. (2012). 7. Aikawa et al. (2015). 8. Coutens et al. (2019). 9. Crimier et al. (2010). 10. Ceccarelli et al. (1998). 11. Parise et al. (2012). 12. Monte Carlo calculations from Vasyunin & Herbst (2013). 13. Sakai et al. (2012). 14. Hily-Blant et al. (2010). 15. Schwarz & Bergin (2014).