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Fig. E.2.

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Line ratio trends with metallicity. Top: HCN/CO(2–1) against metallicity Bottom: HCN/HCO+ against metallicity. Dark markers indicate significant data (S/N ≥ 3) and light markers show non-detections (S/N < 3). The red hexagon markers show the average trends over all data obtained via spectral stacking. We note that the HCO+ data will be separately published and studied in more detail along with other dense gas tracers in Neumann et al. in prep. Here, we only show the HCN/HCO+ variation with metallicity to highlight the flat trends hence supporting HCN as a tracer of density across the full molecular gas disc of NGC 4321.

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