From top to bottom panels: projected Rayleigh statistic (V, Eq. (A.10)), its variance (σV, Eq. (A.11)), its variance estimated using the Monte Carlo sampling introduced in Sect. B.1, and r values from channel pairs with V > 3ςV, where ςV represents the population variance of V in the indicated velocity range, as estimated from Eq. (5). These values correspond to the relative orientation angles ϕ calculated between HI and 13CO velocity-channel maps in the range 30 < vLSR <60 km s−1.
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