H¹³CO⁺(1–0) and HN¹³C(1–0) integrated intensity maps (color scale and red contours). The red contours outline the area where the ¹³C lines have a good signal-to-noise ratio and the optical depth correction was applied for thecolumn density calculation. The thick white contour in each panel traces the 3σ level of the respective ¹²C isotopologueline integrated intensity shown in Fig. 2. The beams, ellipses, and polygons are the same as in Fig. 2.