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Published online by Cambridge University Press: 30 March 2016
Dr. Pacini has dealt with the innermost parsec; my job is to comment on the next 999,999. I have four comments.
1. A reminder of the importance of using the bulk kinetic energy of whatever beam or jet there is - forms of energy that exert pressure will get lost on the way out because of adiabatic expansion (Longair et al. 1973).
2. What is the asymmetry of jets trying to tell us?