Projected Rayleigh statistic, V, the statistical test of spatial correlation between HI and 13CO velocity-channel maps in the HOG method. The panels correspond to the rejection criteria I ≥ σI, I ≥ 3σI, I ≥ 5σI, and I ≥ 7σI. The contours correspond to 3, 4, and 5ςV, where ςV is the population variance defined in Eq. (5).
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