Let us consider that we have obtained an experimental curve sM(s) with uncertainties SX that can be either standard deviations (SD, i.e., X=D) or standard errors (SE, i.e., X=E). This means that we have a discretized signal of N measured points at the values s i indexed by the index i = 1, 2, . . . , N. In other words, we have a set of points {sM(s i ) ± SX i } N i=1 . For doing the FT of the data, in GED, we usually modify the measured points into a new set of values by multiplying with a modifying function f (s) as