Distribution of the variability parameters, SF_∞ and τ, in the observed frame, measured from the ugriz bands as a function of rest frame wavelength. The coefficients of the Eq. (3) are calculated by fitting these values, corresponding to both the amplitude and timescale of variability. The dotted line represents the linear fit with slopes −0.456 and 0.19 for SF_∞ and τ, respectively.