Violin plot of the distribution of the difference between the log10 abundance predictions from the astrochemical models and those from the emulator using a kernel density estimate from the 10 000 simulations in the validation dataset for CO, CS, H, HCN, and HCO⁺. Bottom plot: zoomed-in version of the top plot. Bottom plot: thick black lines represent the interquartile range and the thin black line the 95% confidence interval.