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Appendix A: Channel map of the filamentary gas wisp

In Fig. A.1 we present the channel maps of the ¹³CO(1–0) emission from the GRS (Jackson et al. 2006) survey. Some contamination from local clouds is indicated.

	Fig. A.1 Channel maps of the GRS (Jackson et al. 2006) 13CO(1–0) emission of the region. The contaminating gas has a narrow (~0.5kms-1) line width, and is detected only in single channels in the map. Some contamination from local clouds is indicated with red circles as examples, and these red circles are also plotted in yellow in the adjacent velocity channels for comparison.
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Appendix B: A comparison with CO emission from the ~50 kms^-1 component

To demonstrate the coherence of our filamentary gas wisp, in Fig. B.1 we present a map of the same region with the velocity integrated within 29.5kms^-1 < v_lsr < 73.3kms^-1. Seen from the ¹³CO(1–0) emission, this component is composed of individual patches of molecular clouds and is not as coherent as our filamentary gas wisp. The distance to the region is ~5.3 kpc.

	Fig. B.1 Velocity-integrated 13CO(1–0) map of the ~50kms-1 clouds. The emission is from the same region as shown in Fig. 1 and is integrated within 29.5kms-1 < vlsr < 73.3kms-1.
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© ESO, 2013