Fig. 2
Three N2H+ maps obtained from a Mopra survey (Jones et al. 2012). The images are integrated over different velocity ranges in order to emphasize coherent structures. Regions identified in the X-ray map are overlaid: they appear in three different velocity ranges. The molecular cloud associated with the Arches cluster appears in a fourth range around − 25 km s-1, which is not shown here.
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