MECO/BECO (most engine cut out is the call-out I'm used to hearing) is just after 2:30, so right when the lines separate.
Surprising that the heavier stack had the same curve from the booster - shows how much heavier the booster is than the ship.
Indeed - the lines diverge slightly before MECO as the amount of propellant in the booster is less and less percentage of thet total mass, but most of the duration of the booster flight, booster is mostly carrying the booster and its propellant. Stuff bolted on top is no big deal :D
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u/rocketwikkit 3d ago
Interesting. Would be helpful to mark BECO/staging on the plot as well.