Deep throttled = throttled back.
In rocket engines it refers to those designed to be able to be throttled back to 20% and even stopped and restarted multiple times.
Something done routinely, of course, by Falcon and Starship engines.
In this case the other 30 have been shut down and three centre throttle back to 50% to maintain fthe speed achieved until separation and will then be used (in the planned design, for the burn back and landing.
Last edited by ORAC; 16th August 2023 at 07:54.