Position-velocity diagram of ¹³CO gas (grey-scale), protostars (yellow ×-symbols), and stars (blue +-symbols). The red line indicates the ¹³CO gas ridgeline (see 4.2). Gas velocity profile is integrated over α. Protostars generally have velocities very close to the peak velocity of the local gas, whereas stars are further displaced. That is, stars have both greater kinetic and greater potential energy than the protostars relative to their local gas columns. Ordinate is δ [deg].