SOFIA/GREAT spectra of CO (12–11) and (13–12) in Cep E, together with the low-J CO (2–1) transition, taken at the position shown in Fig. 1. The CO (13–12) and (2–1) spectra are taken from data with a spatial resolution of 20′′, while the spatial resolution of the CO (12–11) is 217. The two upper spectra have been shifted along the Y-axis. The green horizontal lines show the zero level of each spectrum. The dashed vertical lines indicate the limits of each velocity range defined in Table 2. The dotted vertical line shows the systemic velocity ( − 11 km s^-1). The spectral resolution is 3 km s^-1 for all lines.