The above stress can be approximated by a sinusoidal function (i. e. sine wave) with an average 2,590 kPa, amplitude 233 kPa, and a frequency of 6 Hz. At a second flight condition, the stress had an additional sinusoidal component (i. e., in addition to the first sine wave above) that has three times the above frequency, half of the magnitudes, and 90 degrees out of phase (leading). Determine the amplitude of the second sinusoidal component in kPa.