Fig. D.1.

Schematics of the Cep E (upper left), HH 1 (upper right), HH 212 (lower left), and L1551 IRS5 (lower right) outflow. The continuum-subtracted [O I]63 emission maps from the SOFIA/FIFI-LS observations are plotted in a grey colour scale. Source positions are marked as green stars. Our interpretations of the observed [O I]63 emission are based on previous studies briefly discussed in Appendix D.
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