Profiles of predicted abundance, gas temperature, column density, and line emissivity (dotted curve) as a function of globule depth. Left panel: model that reproduces the observed [C II] 158 μm, ¹²CO and ¹³CO (2–1) line intensities toward the negative-v_LSR CO globules (#1, #2, and #3). The FUV field is G₀ = 40 and the gas density is n_H = 2 × 10⁴ cm⁻³. Right panel: model appropriate for a representative position of the shell where CO is not detected, with n_H = 3 × 10³ cm⁻³, G₀ = 200, and A_V = 1.8 (from Abel et al. 2019, and references therein).