Left: the color scale shows the [DCN]/[HCN] ratio, the red contours mark the DCN emission at 216.112 GHz, the blue contours the H¹³CN emission at 259.011 GHz. Right: the color scale shows the [DCO⁺]/[HCO⁺] ratio, the red contours mark the DCO⁺ emission at 144.07728 GHz, the blue contours the H¹³CO⁺ emission at 260.255 GHz. The contour levels are 5σ, 10σ, 15σ, 20σ, and 25σ. The black circles represent the 2 and 3 mm beams.