In M-mode, which axis represents reflector depth?

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Multiple Choice

In M-mode, which axis represents reflector depth?

Explanation:
In M-mode, depth is shown along the vertical dimension. The display maps each depth along the beam to a position up and down on the screen, while time progresses left to right along the horizontal axis. So reflector depth is represented by the vertical axis, with deeper interfaces appearing lower or higher on that axis as time advances. The horizontal axis simply tracks time, creating a temporal trace of motion.

In M-mode, depth is shown along the vertical dimension. The display maps each depth along the beam to a position up and down on the screen, while time progresses left to right along the horizontal axis. So reflector depth is represented by the vertical axis, with deeper interfaces appearing lower or higher on that axis as time advances. The horizontal axis simply tracks time, creating a temporal trace of motion.

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