Mean intensity, J_v, of the total emission in the wavelength range 72 < λ/nm < 250 for a molecular cloud illuminated by one side. From top to bottom the four panels show the expected mean intensity from H₂ lines, H₂ continuum, H lines (Lyα and Lyβ), and ISRF at four different column densities, from N = 10²¹ to 4 × 10²² cm⁻². Insets show the components of J_v at 400 < λ/nm < 700, highlighting three lines of the Balmer series (Hα, Hβ, and Hγ). Results are shown for model ℋ, χ = 1, H₂o:p=0:1, and R_v = 3.1.