Upper panel: H¹³CN (1−0) average emission map with extraction regions enclosed by pink curves. Lower panel: HC¹⁵N (1−0) average emission map with extraction regions enclosed by pink curves. The wedge on the right of each panel indicates the range of flux density (Jy beam⁻¹). The ellipse in the bottom-left corner of each panel represents the NOEMA synthesised beam. White triangles mark the positions of continuum sources as identified by Neri et al. (in prep.).