a) The HCO+(4–3) integrated intensity map obtained for NGC 1068. Contour levels are: 5σ, 10σ to 70σ in steps of 10σ, and 85σ. The filled ellipse shows the HCO+ beam size, similar to that of CO(3–2). Panels b) and c) show a zoomed-in view of the HCO+ and HCN images, respectively, with 3σ contours added to the list of displayed levels. d) Same as b) and c) but for the CS(7–6) line. Contour levels are: 3σ, and 5σ to 40σ in steps of 5σ. The assumed value of 1σ common for all lines is ~0.20 Jy km s-1beam-1.
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