The gray-scale background is the Herschel 160 \(\mu\)m map, and the red and blue contours are the red-shifted and the blue-shifted components of FCRAO \(^{13}\)CO (1-0) emission around the center velocity of L1689B (~ 3.63 km/s). The black circles are the same as the red circles in Fig 1. The scale bar on the bottom left is 0.1 pc.