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\sections{Methods \section{Methods  and Results} First thing we did is run the RHT algorithm (some reasonable parameters) on each of the HI data slices (binned at 4x 0.736 = 3 km/s) relevant to the fibers. Then we made masks from each of those RHT results. In particular, we chose the angle range that corresponded to the HI fiber direction, and integrated the RHT, and set a threshold of 0.1 to make a bitmask. This gives a reasonable mask that "finds" the fibers. Then, using dialation, we make an "off" mask for each velocity slice. We then concatenate these masks. On masks are shown in red, off in blue below.