PdbI only (left panel) and merged PdBI+Nobeyama 45 m N₂H⁺(1 − 0) data (right panel). The color-scale shows the 70 μm extinction feature, and the contours present the integrated N₂H⁺(1 − 0) emission of three different velocity components as indicated in the figure. To avoid hyperfine-splitting overlap, these integrated maps were created from the isolated hyperfine component − 8.0 km s^-1 apart from the central component, and then the velocity shifted to the center to be comparable with other line measurements. The contouring is done from 15 to 95% of the peak emission of each dataset, respectively. The mm-labels, a synthesized beam and a scale-bar are shown as well.