Results of the HOG analysis of the THOR HI and GRS 13CO observations. Left panel: projected Rayleigh statistic, V (v13CO, vHI), the HOG statistical test of spatial correlation between HI and 13CO velocity-channel maps, defined in Eq. (3). The contours indicate the 3ςV, 4ςV, and 5ςV levels in the corresponding velocity range. Right panel: mean resultant vector length, r(v13CO, vHI), with the 3ςV confidence interval, a HOG metric that is roughly equivalent to the percentage of gradient pairs that imply the spatial correlation between the velocity-channel maps, defined in Eq. (2).
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