NO column density (left) and emission (right) for the dust trap models with different initial conditions. The different rows indicate the effect of additional H₂O (first row), NH₃ (second row), H₂O and NH₃ (third row), and NO (final row). The NO column density in the bottom row is dominated by that hidden underneath the τ_dust = 1 layer. The chemical network inside the dust trap is evolved for 100 yr whereas that outside is evolved for 1 Myr. The horizontal black line in the left column indicates the NO column density derived from the observations and the black line in the right column indicates the observed emission. Note: a difference is apparent in the vertical axis of the bottom left panel.