Figure (e) illustrates the dependence of the signal intensities on DC pulse duration t p in the "ZF-ZF" sequence (the pulse amplitude was fixed). Nutation curves display sinusoidal dependence of the signal intensity on the pulse duration for both the J and 2-J peaks, each with an initial phase near 0 and a period of ∼ 540 µs. This period corresponds to a DC pulse amplitude B p = 40 µT. This field value matches the expected strength given the applied current (∼ 400 mA) and the coil's calibration factor (∼ 0.1 µT/mA), which was derived theoretically based on the coil's radius (43.5 mm) and number of turns (5).