Abundance distribution of H₂CO (left), DCN (middle), and CH₃CN (right). The black contours in the maps show the continuum smoothed to the same resolution as the line data, starting at 5σ and increasing to 45σ in 10σ steps (σ = 0.81 mJy beam⁻¹). The beam is shown in each panel and a scale-bar is shown in the middle panel. Abundances are only calculated where both the continuum emission and integrated intensity of the H₂CO 3₀₃ −2₀₂ and DCN 3−2 lines are above 3σ and where CH₃CN 12₄ −11₄ is above 5σ. The uncertainty in the abundances is conservatively estimated to be around a factor of two (see text for details).