Cumulative flux of [CII] 158 µm (upper panels), [OIII]5007 Å (middle panels), and Hα (lower panels) as a function of the hydrogen column density (N_H). We show CLOUDY models log U = −4.00, log n = 3.00, Z = 0.5 5 Z_⊙ (left panel; low U) and log U = −2.00, log n = 1.00, Z = 0.55 Z_⊙ (right panel; high U). The different SFHs are represented with solid (continuous SF) and dashed lines (quenching Δt_q = 5 Myr). Red lines are associated with SB99 models, blue with BPASS models.