Panels a and b: P_gas of C₂ (0,0) and C₂ (3,4), respectively. Panels c–f: P_gas of the CN(2,0), CN(3,1), CN(1,0), and CN(2,1) transitions, panels g–i: those of the NH₂ (0,7,0), (0,6,0), and (0,10,0) α bands, respectively. Solid lines are median-smoothed within the wavelength resolution (i.e., Δ λ ~ 0.002 μm), and the background gray dashed lines present the modeled distributions of line emissions under the fluorescence equilibrium at the observation geometry of 2P. The right axis of panels a–i was arbitrarily scaled for visibility. More detailed information is described in the text.