Selection of observed lines of phenalene in TMC-1 from the QUIJOTE line survey (black histogram) and synthetic spectra (red curve) calculated adopting a column density of 2.8×10¹³ cm⁻². Blanked channels correspond to negative features produced in the folding of the frequency switching data. The lines are indicated by arrows and their quantum numbers are depicted for each feature. Other lines from molecules previously studied or unknown features are indicated in blue. The abscissa corresponds to the rest frequency assuming a local standard of rest velocity of 5.83 km s⁻¹. The ordinate is the antenna temperature in millikelvin.