Karmadon canyon Full-wave signals (reflected).

Circles mark signal from: - the boundary "the glacier - surface of the earth" (left graph); - and strong signal, supposedly from the stop wall (right graph). Boundary "the glacier - surface of the earth" is located on the mark 980 ns on the right graph and 900 ns on the left graph (they are noted by pointers). Boundary is determined by an abrupt change in the nature of the signal.