Acetone detected in 15 of 60 hot cores shows strong correlation (r=0.82) with acetaldehyde column densities and models overpredict the acetone-to-methanol ratio.
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The CH₃OH/CH₃CN ratio in the S68N outflow is constant at ~100-200 and matches gas-phase astrochemical models only when cosmic-ray ionization rates are raised to ~10^{-14} s^{-1}.