Emission spectra of carbon cluster samples in the near-IR region. Note that F_v is displayed as a function of wavelength, as in Sellgren (1984). The spectra are normalised so the integrated emission is unity. Upper panel: spectra obtained for the four families of C₆₀. Lower panel: spectra obtained for the cage families of C₆₀ and C₄₂. The dashed lines emphasise the relative value of emission intensity of C₆₀ cage sample at 2 μm. Observational data of the NGC 7023 reflection nebulae at 30"W 20"N position, as extracted from Sellgren (1984), are shown as blue dots.