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Fig. 10

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HNCO (40,4–30,3) moment 0 maps obtained in the velocity ranges 40–50 km s–1 (top left panel, the hole), 50–60 km s–1 (top right panel), 60–70 km s–1 (bottom left panel, the shell), and 70–80 km s–1 (bottom right panel, the clump). The contour levels are 0.1 steps from the maximum of the maps (50, 65, 90, and 77 K km s–1, respectively). The synthesised beam is the ellipse indicated in the lower left corner (2975 × 2975). The white stars are Sgr B2(S), (M), (N), and G+0.693 from the south to the north, and the purple star is the C3 condensation.

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