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The horizontal axis represents the magnetic field H and the vertical axis represents the magnetic flux B. The curve starts from the origin O and travels a path to a saturation point A sub 1 in the first quadrant. Then the curve forms a hysteresis loop that intersects the vertical axis at A sub 2 and negative horizontal axis at A sub 3. The point A sub 2 indicates B sub r. The saturation point in the opposite direction is labeled A sub 4.