Intensity, intensity gradients, and relative orientation angle maps from the THOR HI and GRS 13CO observationspresented in Fig, 7. Left panel: HI (teal) and 13CO emission (red) in the velocity channels with the largest spatial correlation in the velocity range −5 ≤ vLSR ≤ 30 km s−1, as inferred from the V values shown in Fig. 9. Middle left panel: norm of the gradient of the HI intensity map in the indicated velocity channel. Middle right panel: norm of the gradient of the 13CO intensity map in the indicated velocity channel. Right panel: relative orientation angle ϕ, Eq. (1), between the gradients of the HI and 13CO intensity maps in the indicated velocity channels. The white color in the ϕ map corresponds to areas where the gradient is not significant in either tracer, as estimated using the rejection criteria described in Appendix A.2. The rectangle shows the block, selected from a 7 × 3 spatial grid, with the largest values of V. The black circles in the rightmost panel correspond to the positions and effective sizes of the MC candidates from the Rathborne et al. (2009) catalog in the aforementioned velocity range.
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