Reading air speed on the Garmin G-1000

I have a general question about the G-1000, and it probably pertains to the G-3000 as well. When looking at the vertical airspeed indicator on the left of the screen, I know that the red vertical strip at the bottom is the speed where the aircraft will not fly. Moving up, the white strip is the area where the flaps can be operated, and the green strip above is the normal operating range. The red strip above that is the overspeed area where the airframe will be stressed and indicates you’re going too fast. Here’s my question: Sometimes when I’m flying in the normal operating green area, I see a tiny little red vertical strip to the right that is about as wide as a thread. What is this? I think it appears when the throttle is being moved.

That marker shows how your airspeed is changing - i.e. if you’re accelerating or decelerating.

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Could be the speed change vector. Like a prediction where your speed will stabilize in current power settings.

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You’ll see that on several of the indicators. In your case, it indicates where the speed will be in 6 seconds at the current rate of change. (Used to be six seconds, not sure it that’s the timeframe they use in the sim).
You’ll see it on the turn indicator, etc…
Regards