Left: zoom-in of position-velocity diagram shown in Fig. 8. Green box indicates the area in the diagram on the right. Right: N2H+ position-velocity diagram of the northern portion of the ISF. Red line is the 13CO gas ridgeline while the green line shows thevelocity centroid of the N2H+ line. The protostars (yellow ×-symbols) have velocities that are slightly displaced from the CO gas but directly associated with N2H+. Ordinate is δ [deg].
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