Left panels: histograms of oriented gradients (HOGs) corresponding to the pair of velocity-channel maps with the largest spatial correlation, as inferred from the V values shown inFig. C.3, and three pairs of arbitrarily selected velocity channels in the synthetic observations of the Clark et al. (2018) simulations without the 100-K HI background emission consideredin Sect. 3. Right panels: for the pair of velocity-channel maps with the largest spatial correlation, HOGs corresponding to the entire map and just the block with the largest V indicated in Fig. C.1. Top and bottom panels: face-on and edge-on synthetic observations, respectively.
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