Band 6 integrated intensity (moment 0) and velocity field (moment 1) maps (of emission only) of the ground-state HCN and HCO⁺ 3–2 lines. We note that the white “hole” in the centre is due to absorption and that absorption affects the line profiles out to at least 50% of the continuum. Some of the “missing” emission in structures is also due to line self-absorption.. The HCN and HCO⁺ 3–2 line emission is overlayed on the 1 mm continuum contours (0.5 × (1, 2, 4, 8, 16) mJy). The cross marks the position of the 265 GHz continuum peak. Left panel: HCN 3–2 moment 0 map where colours range from 0 to 0.9 Jy km s⁻¹ beam⁻¹; left centre panel: HCO⁺ 3–2 moment 0 map with colours ranging from 0 to 0.48 Jy km s⁻¹ beam⁻¹. Right centre panel: HCN 3–2 moment 1 map. Right panel: HCO⁺ 3–2 moment 1 map. Colours range from 3700 to 4000 km s⁻¹.