Centroid map of the isolated hyperfine component of N2H+ in the junction region. The light blue and dark red lines show the contours of the 13CO emission from the IRAM data integrated between 3.6 and 6.0 km s−1, and between 6.3 and 9.3 km s−1, corresponding to the north-eastern filament and the main filament, respectively. The levels are between 3 and 18 K km s−1 by steps of 1.8 K km s−1, and between 12 and 18 K km s−1 by steps of 1.8 K km s−1 for the blue and red contours, respectively. In the white area, no line fitting was attempted because the N2 H + has a S/N <3.
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