Mean abundances computed with the dynamical model (filled circles) as a function of density (see text). Standard deviation for the cold core is shown with vertical bars. Red and blue stars mark the observed abundances in L694 (this study) and L429-C (Taillard et al. 2023), respectively. Crosses and diamonds denote the abundances obtained at the best times with the static models, which only probe the density where the three molecules (CO, CS, and CH₃OH) used to determine the ‘best time’ are detected. Results obtained from using both cosmic-ray sputtering yields are shown for all the models.