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Fig. 4


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 in Fig. 6, and three pairs of arbitrarily selected velocity channels in the synthetic observations presented in Fig. 2. Right panels: for the pair of velocity-channel maps with the largestspatial correlation, HOGs corresponding to the entire map and just the block with the largest V indicated in Fig. 5. Top and bottom panels: face-on and edge-on synthetic observations, respectively.

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