Time-dependent fractional abundance plots (with respect to H₂) for select COMs, for the innermost trajectory in each accretion-rate model. Panels a through c show all-time innermost trajectory fractional abundances for methanol (black), ethanol (blue), methyl formate (green), glycolaldehyde (yellow), and dimethyl ether (red). Panels d through f show all-time innermost trajectory fractional abundances for formaldehyde (black), methyl cyanide (blue), ethyl cyanide (green), methyl isocyanide (yellow), and vinyl cyanide (red). Upper panels a and d correspond to the 3.0 × 10⁻³ M_⊙ yr⁻¹ mass-accretion rate, middle panels b and e correspond to the 1.0 × 10⁻³ M_⊙ yr⁻¹ mass-accretion rate, and lower panels c and f correspond to the 1.0 × 10⁻⁴ M_⊙ yr⁻¹ mass-accretion rate. Solid lines correspond to gas-phase abundances, whereas dashed lines correspond to surface/ice-mantle abundances. It should be noted that the range for the horizontal axis is different for models of different mass-accretion rates.