Calculated spectra (black) compared to experimental optical emission spectra (magenta) of shock-induced C₆₀. Self-absorption was taken into account in the simulations. Adjusted values of ∈_tot, [C₂], and T_gas: (a) 5.0 × 10⁻², 2.0 × 10¹⁶ cm⁻³, 4800 K; (b) 6.5 × 10⁻², 3.0 × 10¹⁶ cm⁻³, 5200 K; (c) 4.7 × 10⁻², 1.5 × 10¹⁶ cm⁻³, 5200 K; (d) 1.05×10⁻¹, 2.6 ×10¹⁶ cm⁻³, 4800 K; (e) 8.5 × 10⁻², 2.8 × 10¹⁶ cm⁻³, 4000 K. The bands between 350 and 440 nm flagged with an asterisk (*) were assigned to CN transitions arising from nitrogen contamination. The CN bands were simulated using the LIFBASE package (Luque & Crosley 1999) and their intensities were manually adjusted to match the experimental values. Contamination by sodium (Na I) and aluminum (Al I) was also identified.