 After the first 90° pulse, the magnetization vector spreads out as described above, forming what can be thought of as a “pancake” in the x-y plane.The spreading continues for a time formula_1, and then a second 90° pulse is applied such that the “pancake” is now in the x-z plane.After a further time formula_2 a third pulse is applied and a stimulated echo is observed after waiting a time formula_1 after the last pulse.