Selected lines of the isomer 3-CNACY observed in the K and Q bands. The abscissa is the rest frequency in MHz adopting a V_LSR for the source of 5.83 km s⁻¹ (Cernicharo et al. 2020). The ordinate is the antenna temperature corrected for atmospheric losses in mK (same scale for all panels). The labels α, β, and γ correspond to unresolved doublets with K_a = 0,1, K_a = 1,2, and K_a = 2,3, respectively. The red line corresponds to the synthetic spectrum computed with the physical parameters discussed in the text.