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Only if we are looking at M number. The reason for that curve is the limit airspeed is a constant CAS of 800 knots - which of course results in a changing mach with temperature.
I find using M an easier reference for top speeds - it is around 800KCAS and you can easily go through it low level because it is a manual limit defined by the canopy.
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Unfortunately it seemed to you be a prophet…
Prophet to some; rambling pain-in-the-arse to others.