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Fig. 4

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a) Same as in Fig. 1a; b) ALMA-only image of the N2H+(1−0) integrated intensity over the 7 hyperfine structure components. The rms noise on the resulting map is ~ 6 mJy/beam km s-1. The contours go from 0.1 to 1.5 in steps of 0.7 Jy/beam km s-1 and 1.5 to 9 in steps of 1.5 Jy/beam km s-1. The crosses mark the positions of the two dense cores. The ALMA beam is represented as a yellow elliptical symbol in the bottom-right corner of the image. We can see the excellent match between the Spitzer dust extinction of the filaments and the N2H+(1−0) emission; c) ALMA N2H+(1−0) velocity field using the first order moment map. The crosses mark the positions of the cores and the contours are the same as in the b) panel.

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