Preperihelion time evolution (decreasing r_H) of the CS (top) and HCN (bottom) mixing ratios relative to H₂O in comet A1. Black open symbols show results from this work. Blue-colored, solid symbols show contemporaneous measurements adopted from N. Biver et al. (2024) while the red-colored, solid symbol shows measurements from S. Faggi et al. (2023). Shown error bars represent 1σ uncertainties that include an additional 10% contribution from the absolute flux-scale calibration to account for comparison between differing facilities. Dashed lines represent radio canonical average abundances from D. Bockelée-Morvan & N. Biver (2017).