anomalies?

[Royalwal]

The picture mark is a bit high. What is the reason for the abnormal point?(714,715)

n = 730
A = 50
center = 100
phi = 30
T = 2 * np.pi / 100
t = np.arange(n)
sin = A * np.sin(T * t - phi * T) + center
sin[235:255] = 80 //input Time series data

[Yancy456]

At the beginning and end of time series,the values of spectral residual are always high,because of the uncontinuity of sequence.