Example – Red Noise
		q  The mathematic form of red noise is as following:      a: the degree of memory from previous states (0 < a < 1)      e: random number      Dt: time interval between data points      x: standardized variable (mean =0; stand deviation = 1) q  It can be shown that the autocorrelation function of the red noise is:      Te is the e-folding decay time.