From left to right the CO(3–2), CO(6–5), HCN(4–3), and HCO+(4–3) emission line profiles towards the position of the AGN. The corresponding apertures are 0.6″ × 0.5″ (40 pc) and 0.4″ × 0.2″ (20 pc) for observations in Band 7 (CO(3–2), HCN(4–3) and HCO+(4–3)) and Band 9 (CO(6–5)), respectively. The red lines identify the 1σ level for each transition in order to illustrate the reliability of detections. The undetected CS(7–6) line is included in the last panel (green histograms). Velocities refer to vsys(HEL) = 1127 ± 3 km s-1.
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