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Fig. 3

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Top: longitude-velocity diagram of HCO+ emission from the CMZ and PMZ covering the whole survey in the latitude range between to . The contour levels start at 0.021 K (3σ), and increase in steps of 0.058 K (8σ). Middle: longitude-velocity diagram of SiO emission from the CMZ and PMZ covering the whole survey in the latitude range between to . The contour levels start at 0.01 K (3σ), and increase in steps of 0.018 K (5σ). Bottom: longitude-velocity diagram of H13CO+ emission from the CMZ and PMZ covering the whole survey in the latitude range between to . The contour levels start at 0.009 K (3σ), and increase in steps of 0.016 K (5σ).

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