N(DCO⁺)/N(HCO⁺) column density ratio computed assuming 30 K (right panel) and using the moment 0 intensity map of HCO⁺ (middle panel in orange) and DCO⁺ (left panel in blue). Contours starts at 3σ with 3σ steps (σ = 0.32 mJy beam⁻¹ km s⁻¹) for DCO+ and 6σ steps (σ = 3 mJy beam⁻¹ km s⁻¹) for HCO⁺. Note that the ratio values represent an upper limit due to optical thickness and contamination of HCO⁺ (see text). Primary beam and beams are reported.